5 - Oudebromfiets.nl
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1. 80 Gearbox capacity cc 350 350 350 350 350 350 Petroil mixtur 125 25 125 125 125 125 Oil grode for petroil mixture SAE40 SAE40 2strokeoilor Zatrokeoior 2 strokeollor 2 stroke oil or Zstokeoilor 2strekeoilor SAEAD SAE 40 SAE 40 SAE40 engine oil engine oil engine oil engine oil engine oil engine cil per 100 km 161 141 161 E 181 181 Carburettor Model Code n 1 1 anero 106 60 Cross section 16 16 16 16 16 B Main Jet 70 7 70 8 70 Needle Jet 220 220 220 217 27 220 Needle setting stop from top 3 idling Jet Air Adjuster Screw E 3 3 Electrical System Bosch Bosch Bosch Bosch Bosch Bosch NBW 6V23 W vw Ignition timing before TOC 18mm 1 8mm 18mm 18mm 18mm 18mm Contact Brecker Gop 035 045 035 045 035 045 025 045 025 048 035 045 Co KSS0Super KS50Super KSS0Super KS100 Scooter R50 Scooter RS50 on 515002 515081 515 061 514 320 561 003 561 004 06 022 276 002 276 026 276 026 231 320 287 020 276 010 276 44 2 50 E E 3918 39 418 3545 3048 854 9 42 46 48 26 46 a 7200 6900 7500 4500 7000 roke 2 stroke 2 stroke stroke 2 stroke 2stroke 2 stroke E SAEBD SAE80 SAE SAE80 SAES0 30 350 450 350 350 5 125 125 125 125 125 125 2 trokeoilor 2strokeoilor Zstrokeoilor 2strakeoilor 2 tokeoilor 2 stroke oil or E40 SAE 40 SAE 40 SAE 40 SAE 40 SAE 40 SAE 40 jine o2. SERVICE GunBAre Servicing Manual for Two Stroke Engines up to 100 cc Issued February 1966 Subiekt to alterations ZUNDAPP WERKE GMBH M NCHEN 8 M nchen 8 Anzingor Stra e 1 3 _ Printed in Germany FOREWORD Advances in the design of motorised two wheelers during the last few years particularly for the lower cubic capacities have greatly stepped up engine output as well as riding comfort ZUNDAPP machines in particular have led the way and gained an enviable reputation for good engineering design and solid construction Each new ZUNDAPP model will always make its contribution to wards justifying our excellent reputation so as to maintain and increase the popularity of ZUNDAPP machines One of the most important factors in ensuring our continuing success is a first class after sales service That is why we are anxious to acquaint all our distributors and appointed service stations with the latest developments Throughout the winter months our ZUNDAPP training centres are holding courses for service mechanics This manual is designed to save students at these courses the time wasting trouble of taking copious notes and to be a permanent record which they can consult at any time to refresh their memory The descriptions of dismantling and assembly operations have been compiled with clarity and simplicity in view and are accom panied by numerous illustrations We trust that every distributo
3. To obtain the required axial play of 0 1 mm fit 0 6 mm packing washers between ball bearing in clutch gear and clutch shifter hub fig 71 Mounting Clutch The clutch shown in fig 72 is fitted to the following engines Type 267 up to No 3484 123 Type 276 up to No 4045 406 Type 281 up to No 4600 606 Fit retaining lining and outer steel plates then fit cover plate To align bores for the spring sleeves correct ly the clutch shifter hub is marked with a reference line and all plates with internal splines have a special aligning bore Make sure that all these bores are accurately aligned on the line mark fig 72 Having fitted the cover plate run down the nut and tighten it firmly holding the assembly steady with tool SK A 279 a ee Clutches with 4 plates 09 73 are fitted to Type 267 as from No 3484124 Type 276 as from No 4045407 Type 281 cs from No 4600607 All scooter engines are fitted with 4 plate clutches Assemble as foll ows Fit retaining plates lining and outer steel plates then fit cover plate Here again the clutch hub has reference line and all plates an aligning bore Underneath the reference bore on the cover plate an arrow is addi tionally marked which must be in line with the mark on the hub Also note that the dished side of the upper steel plate must face the gearbox Having placed the fourth plate in position fit the cover plate so that the dished s
4. again until the stop engages in the recesses providing the internal stops for the selector drum To mount the pedal selector spindle set the transmission to 2nd gear fig 84 Fit selector slide ond pedal gear change spindle Note that the taper groove on the selector drum enga ges with the mating piece on the selector slide while the recess on the deflector engages over the pin on the right hand casing Oil all moving parts fig 85 Mounting Clutch Bell Cover Insert two press fit bushes into the right casing coat the joint faces with sealing compound then fit clutch bell housing cover Introduce one bolt M 6x45 from the right under the pedal gear change spindle and run it down firmly fig 86 On the left hand side fit the follow ing screws 267 276 281 A M x120 M6x120 M6x120 B M x120 M6x120 M6x120 C M x98 M6x120 M6x120 D M6x120 M6x120 M6x120 E M6x98 M6x98 M6x98 F M x98 6 98 M6x98 G M6x92 M x92 M6x92 M x98 M6x98 M6x98 j M6x98 M6x98 M6x98 M 6x 98 Screw with cable clip to be fitted only after base plate has been mounted Only fitted to engines of type 281 where it is located between and G fig 87 Fig 84 Fig 85 Fig 87 33 www oudebromtiets nl Fig 88 Fig 89 Fig 90 Fig 91 www oudebromfets nl s Setting Pedal Gear Change Spindle The spindle must be fitted with slight play Press it lightly to the left seen in direction
5. but the permissible play of 0 1 mm as shown in the following example Example Left casing Right casing 42 9 mm Crankshaft 47mm 12mm Axial play 0mm 1 1 mm Standard washer on drive shaft 05mm Remainder flywheel magneto shaft 0 6mm On engines of type 281 the standard washer is 0 2 mm thick Fitting Crankshaft into Right Casing Heat up inner race of ball bearing with a hot mandrel then fit crank shaft fig 43 Fit sealing ring for crankshaft drive shaft using special assembly sleeve MV 6 339 to prevent damage to the sealing lips by the drive shaft thread Drive sealing ring home with light taps of hollow punch MV 6 347 fig 44 Fig 41 Fig 43 Fi lt Mew our Fig 45 Fig 46 4 jg 48 debromtets ni For engines of type 281 use ossembly sleeve SK A 217 first expanding the bore to 13 5 mm Fit two 5 mm steel balls with a little grease into the ball seats of the drive shaft crankshaft then slide on the primary drive gear Finally secure assembly with locking wash er and hexagon nut fig 45 Remember to secure the nut On engines type 281 stick 19 rollers 5 x 3 5 dia with a gene rous grease coating into the bear ing race of the right casing then slide spacer ring 281 05 110 on to the roller assembly fig 46 Measuring Axial Play of Selector Shaft Place gauging bor or the yoke over the right hand casing so that you
6. r Screw with sealing ring s Idling jet www oudebromfiets nl Troubles and their Causes ig Engine will not start Cause Fuel tap not opened star ter aid not operated when storting from cold Jets clogged Carburettor flooded engine drowned Ignition not switched on Spark plug defec tive spark too weak Spark elec trode gap on plug too large spark plug short circuited gap clogged by dirt woter or oil Engine chokes back on starting Cause Ignition timing set too early Engine starts badly Cause Mixture too lean operate starting aid Idling jet clogged Spark plug dirty or oily spark gap too large or too small weak spark Water in fuel Engine starts but stops again after short run Cause Carburettor empty because fuel tap remained closed Engine starts but stops on throttling Cause Main jet or fuel line clogged engine still too cold carburettor badly adjusted Engine starts but carburettor spits back on throttling up coughs and sneezes Cause engine very cold fuel mix ture too lean Jet too small or clog ged Carburettor badly adjusted poor transitions Too many late firings Suction intake line leaks or air enters at carburettor union 1 www oudebromfiets nl Engine starts but runs irregulorly end splutters on throttling up Cause Mixture too rich fit smaller jets alter needle setting of throttle slide Air filter dirty Fl
7. 12 on the setting dome fig 12 10 Take off setting dome remove cy lindrical screw M 6 x 45 underneath starter spindle fig 13 Operate the clutch lever to press off the clutch housing cover Located inside the clutch housing cover are Clutch spindle with lever Clutch dog 2 leaf springs for clutch dog Ball headed threaded pin for re setting clutch dog Bush for starter spindle Georbox oil level checking screw Guide pin for selector slide pedal gear change engines only On engines of type 276 and 281 the third crankshaft bearing is needle bush 277 01 135 engine 267 has no third crankshaft bearing fig 14 Taking off Pedal Gear Change Spindle and Selector Slide Take off pedal gear change spindle 4 and selector slide fig 15 Only on engines with pe dol gear change Dismantling Clutch Fit service tool SK A 235 to clutch with 2 studbolts SK A 237 and 1 stud SK A 265 Take off 5 or 10 nuts M 4 with the 7 mm socket key Slacken the clamping bolt and clutch thrust plate springs and spring bushes can now be taken off On engines of type 267 fit the clamp with 3 studs SK A 237 fig 16 Fig 13 Fig M Fig 15 Fig 17 Fig 18 Fig 19 Fig 20 oudebromfiets n Fit hold down tool SK A 279 to clutch thrust plate then release clutch nut with the socket ke fig 17 Take off clutch complete with hub and the packing washers behind the hub fig 18
8. 50 Super Sport Combinette and Super Com binette 433 With these designs the engine is started from cold as follows Close throttle slide all the way and with the pressure pin and knob press the starter slide down As you start pull out throttle about one third to one half of the way to a clearly perceptible stop Once the engine has come to life leave the throttle in this intermediate position until the engine has run itself warm Then open throttle all the way and this will also raise the starter slide to its end position where it engages If on starting you inadver tently pull out the throttle too far so that it overrides the stop and takes the starter slide with it so that the knob jumps back again press the starter knob once more Starter Jet Carburettors see carburettor for KS 100 On these designs a cylindrical starter jet housing is arranged next to the main hous ing whose piston is operated by Bowden cable In its top position the piston un covers the port which admits starting air from the filter socket and the starting fuel mixture port leading to the carburettor intake socket Fuel enters from below through the starter jet into this housing which generally also has a storage chamber When the engine is started from cold the piston is raised while the throttle slide remains closed The fuel is first drawn from the storage chamber and when this is emply through the starter jet It is then mixed with the starting intoke
9. adjuster screw close the throttle slide until the engine just ticks over slowly and steadily On carburettors without separate idling speed system the needle jet as sembly supplies the amount of fuel required for idling speed Carburettors with separate idling speed system work as follows The dir adjuster screw controls the ratio of the fuel air mixture supplied by the idling speed system By turning the adjuster clockwise the mixture becomes richer by turning anti clockwise it becomes leaner The setting is correct when the engine ticks over quietly and evenly As soon as it does do not alter the air adjuster setting again since this also governs the lower and medium speed range so that any further ad justment might increase fuel consumption When the throttle is slowly opened out the engine should steadily rev up It should neither splutter nor should the speed drop back again at any throttle setting If the engine splutters or speed rises in surges or if black fumes escape from the exhaust silencer the mixture has been made too rich If the engine coughs or cuts out for brief moments if a blue flame blows back from the carburettor or if the engine is difficult to start the mixture has been set too lean Driving Speed Range In order to determine the most suitable main jet for carburettor first take the machine a straight level road and find out its maximum speed by the speedometer or with a stop watch Generally the ma
10. air to produce at first a very rich mixture which becomes gradually leaner as it flows directly into the intake socket of the carburettor and from there to the engine Once the engine has run itself warm shut off the starter piston www oudebromfiets nl Carburettor for Engines 267 276 R 50 RS 50 a Corburettor housing b Cover plate Hose union with sealing ring d Adjuster screw with spring e Collared screw with spring f Starter shutter In g Float h Float cap i Pin k Float needle I Slide spring m Throttle slide n Needle jet o Main jet p Washer q Jet needle with locating plate m g P jr Carburettors for Engines 267 276 KS 50 Super Sport Combinette and Super Combinette 433 b Carburettor housing Starter slide c Cover plate d Throttle slide e Slide spring f Washer 9 Jetineedle with locating plate h End plug with sealing ring Needle jet Mein jet i k Adjuster screw with spring m Float with float needle n Float housing cover Carburettors for Engines 281 KS 100 9 Cover plug b Float housing cover c Carburettor housing d Float with float needle e Slide spring f Throttle slide g Jet needle h Adjuster screw with spring i End plug with sealing ring k Needle jet 1 Main jet m Screw with sealing ring n Starter piston 9 Spring p Adjuster screw with nut q Air control screw with spring
11. the next larger gear Next with the depth gauge mea sure distance from end face of selector shaft to stop face of selec tor gear fig 50 www oudebromtfiets nl Fig 49 Fig 50 Then measure from the same point to the stop collar of selector shaft fig 51 The distance must not be larger than the value obtained to fig 50 Cor rect any backlash in gears by fitting pacing washers between Ist and 2nd speed gear play must be eli minated to 0 fig 52 Note The balls for the selector gears should be coated with oil not with grease to stick them into posi tion Before fitting selector shaft check that stop pins of selector shaft are correctly mounted com plete with their annular springs Measuring Starter Spindle Check distonce of opposing teeth between driver and kickstarter gear on kickstarter spindle This should not exceed 0 8 mm If it does fit packing washers between shap ring and driver A washer of 1 mm is fitted to the short shaft stub as standard fig 53 With gauging bar and depth gauge measure distance between contact face of right casing and stop collar for stdrter spindle fig 54 Note down the reading 22 On the left cosing meosure the same distance with the same instru ments fig 55 Next measure distance betweenthe two stop faces on the starter spindle fig 56 then make up the difference from the sum of the two measure ments just described by fitt
12. Fig 6 Fig 7 Fig 9 d Fig 10 Fig 11 oudebromfiets nl If the work described in the follow ing passages is confined to a re pair of clutch and pedal gear change system the baseplate can remain on the left casing If the en gine must be completely dismantled take the plate off now first remov ing the 2 cylindrical screws M 4x 15 ond the casing screws M 6x92 complete with coble clip fig 9 On engine model 281 the baseplate is fixed with three screws M4x15 Taking off Clutch Cover Cover for Clutch and Gear Change Setting Controls Take the following screws off the left hand casing cover 267 276 281 a M6x92 M6x92 M6x92 b M6x98 M6x98 M6x98 c M6x98 M6x120 M6x120 d M6x120 M6x120 M6x120 e M6x120 M6x120 M6x120 f M x120 M6x120 M6x120 g M x98 M x 6 98 h M6x98 M6x98 M6x98 ij M6x98 M x98 6 98 with cable clip fig 9 Three screws remain on the casing 2 at the magneto and 1 below the starter spindle fig 10 On engines type 281 ad ditionally take off 1 screw M 6x98 above screw i Remove connector cover closing off the clutch re setting and gear change setting controls for pedal gear change engines The cover is fixed with two countersunk fillister head screws M 5x 15 to the right hand casing cover fig 11 On engines with manual gear change the setting dome for adjusting the gear change as sembly is not provided Slacken 2 fixing screws M 6 x
13. Fit piston ring and support piston with a special fork tool made in your workshop fig 66 Fit cylinder introduce piston care fully and gently into cylinder to prevent fracture of piston ring Note The locating pin in the piston ring groove must sit inside the ring joint Fit cylinder head gasket and cylinder head Fit 4 packing wash ers then tighten the 4 nuts M7 with 11 mm socket wrench working always on diagonally opposite nuts in turn torque 10 6 Ib ft 1 5 mkg see fig 67 Engines of type 267 276 without fan and 281 have two piston rings m Mounting Chain Sprocket Fit the sprocket and secure with washer and hexagon nut use the chain assembly tool to hold as sembly firmly in place Secure nut with tab washer fig 68 Measuring Main Drive Shaft Position Fit the clutch hub cover plate and clutch nut With a wooden spatula or other tool shift the cover plate to the top position then with the depth gauge inserted through the marking bore measure distance to the clutch gear it should be 22 5 mm fig 69 27 Fig 66 Fig 67 Fig Fig 70 Fig 71 Fig 72 www oudebromfiets nl Take the tool away from the cover plate and press main drive shaft down all the way to the stop then measure distance again it should be 21 8 mm Example 225mm 21 8 mm 0 7 mm The values and final clearance list ed are only given as examples fig 70
14. The clutch gear remains inside the right hand casing held by a snap ring on the inside gear box On engines with pedal gear change you can now draw out the steel ball selector through one of the openings in the clutch On engines with ma nual gear change the steelball selector assembly can only be token off after the engine has been completely dismontled Taking off Chain Sprocket Bend open the locking tab washer and with an open ended spanner take off the hexagon nut if necess ary use a two arm puller tool fig 19 Taking off Cylinder and Piston Take off cylinder head and cylinder Remove the 4 nuts M7 with the 11 mm socket key take off the washers underneath then lift away cylinder head head gasket cylinder and base gasket take off piston rings fig 20 On engines type 281 no head gasket is fitted as from engine No 4600937 Press off crank casing then with pointed nosed pliers draw off the retaining ring for the gudgeon pin do not use a screw driver fig 21 Fit gudgeon pin press off tool SK A 64 ond press off the gudgeon pin fig 22 For engines of type 281 vse press off tool SK A 268 Note Remove gudgeon pin needle bear ing from connecting rod and put it away well protected from dust and dirt Taking off Crank Casing To take the main clutch drive gear off the crankshaft first bend up the locking tab washers Hold assembly steady with the 11 mm spanner applied to
15. bush of the right hand casing in place of the selector shaft and securing it with locking washer SK A 233 b Now press the inner face of the selector at the selector lever guide against the end of the setting gauge Turn in threaded pin c un til all play in stop bracket d and thereby in the selector is reliably Fig 38 eliminated Tighten locknut and se cure setting with the tab washer Slacken nut on gauge and take gauge off On 4speed manual gear change engines first fit c bush of 11 5 mm length 14 mm o d and 12 mm i d made in your own workshop then fit gauge SK A 232 figs 37 ond 38 Measuring Axial Play of Crankshaft Permissible play is 0 1 mm To mea sure it you need a gauging bar and a caliper gauge with depth scale Measure from the contact face of the right hand casing to the inner nn ee ee ball bearing race fig 39 5 Then cag out the same check on the left hand casing and add the two values obtained fig 40 c Prepare crankshaft for gauging Fit a washer with 2 mm bevel on to the crankshaft drive shaft bevel facing crank web Fit a washer with 2 mm bevel on to the flywheel magneto shaft bevel facing crank web fig 41 Now measure crankshaft over both webs including special bevelled washers fig 42 then deduct the value obtained from the sum ob tained by the two gauging oper ations shown in fig 39 and 40 Fit packing washers to eliminate all
16. can measure with the depth scale right to the stop face for the selector shaft inside the casing Note the value measured remem bering to allow for the thickness of the scole bar fig 47 Place the bar on the contact face of the left cosing and measure distance to the ball bearing inner race stop face for selector shaft fig 48 Add the value read off to the one already noted 20 Note Remember to allow for thick ness of bar Now measure selector shaft bet ween the two stop faces fig 49 This value will always be smaller than the sum of the two obtained to fig 47 and 48 Fit washers on the shaft between ball bearing and speedometer drive until only a play of 0 1 mm remains for swinging fork machines Example k Measurement obtained to fig 47 227 mm Measurement obtained to fig 48 349mm Sum 57 6 mm Dimensions fig 37 569mm 0 7 mm Axial play Omm Packing washers required 0 6 mm For engines of machines with telescopic fork a spacer bush is fitted to the collar of the selector shaft since the speedome ter drive is taken from the front hub Measuring Selector Gears Fit the selector shaft with the num ber of packing washers calculated into the left casing then fit selector gears in sequence in such a way that the larger collar faces down i e towards the larger gear Gears are correctly fitted if only onb oil groove lies between each two gears and the arrow at the side points to
17. d also be rinsed at regular intervals in either kerosene or petrol After cleaning coat the filter mesh with oil Where a screwed hose union is fitted take this off draw out the filter element and clean it slacken the connector nut and take off float cap On carburettors with side mounted float housing slaken the two screws on the cover take off the cover then take float from housing The float should drop by its own weight from its suspension on to the bottom of the float cap so that it can readily be lifted out The float needl can then be removed after taking off the spring loaded retaining clip On some versions the float lies loosely in the cap The forked part which prevents the float needle from dropping out can be taken off after its fixing pin has been drawn off Do not bend the fork piece and check that it lies horizontally in its top position Never use a sharp hard tool to clean the needle seat or the jet bores but merely rinse them out carefully then blow them out to remove all liquid Do not tighten the locknut too hard but run it down by hand only Use only the original sealing rings for the float cap seal Take care not to bend the float sealing edge otherwise the float may become displaced up or down and no longer seal off the float needle This would lead either to fuel leaks or to a partial or total fuel blockage Use only absolutely clean fuel and fill it through a filler into the tank to prevent trouble with the feed
18. de the available flow cross section increases and consequently the mixture becomes richer The needle setting will only influence fuel consumption un der throttle control With the throttle fully open fuel consumption is exclusively governed by the main jet Fitting Carburettor Carburettors must be mounted with special core They must be positioned accurately vertical and fitted flush and precisely on their connecting socket The slots of the clamping connecting fitting must on no account admit secondary intake air other wise a steady quiet idling speed cannot be set Where connecting flanges are pro vided use only gaskets in perfect condition and tighten nuts evenly Fix Bowden cable sleeves without any sharp bend or kinks Check that throttle slide opens and cioses all the way as you operate either lever or twist grip On carburettors with starter jets the Bowden cable hooked to the starter piston should have a little play to ensure that the piston provides a reliable seal 4 www oudebromtiets nl Carburettor Maintenance From time to time the carburettor should be rinsed out with petrol and thoroughly cleaned While this is done check that all parts are in perfect condition Replace worn float needles needle jets and jet needles as well as throttle slides since these govern engine performance and fuel consumption On carburettors with separate starter jet assembly test that starter piston has tight seal The air filter shoul
19. er of washers and spacer rings fitted os well as the correct meshing position of gears and mark these with reference line for preference Careful attention to correct fit be fore starting to dismantle may save you considerable gauging and sett ing work when the engine is re assembled Take out shafts in this sequence 1 Gear selector shaft with selector gears and steel ball assembly 2 Starter shaft 3 Main drive shaft 4 Crankshaft fig 30 For engines with manual gear selection the steel ball selector remains in the selector fork on the right hand casing Carefully inspect all shafts and gears for traces of wear and pro per alignment as soon as you have taken them off fig 31 Taking off Bearings Bushes and Clutch Gear On engines of type 281 the 19 rollers 5x35 dia can be taken out affer removing spacer ring 281 05 110 fig 32 15 Fig 29 Fig 30 The clutch geor can only be pressed off after taking the circlip in the casing behind the ball bearing from its seat with pair of pointed pliers If clutch gear and both ball bear ings ore in perfect condition they need not be taken off fig 33 If necessary pull the ball bearing 4 from the clutch gear with a stand ard bearing puller tool fig 34 Casings should be warmed first for easy withdrawal of ball bearings and bushes Or use the puller tool to remove them
20. f Gear Change Pedal and Fan Casing Fit engine info service fixture SK A 1926 draw off spark plug connec tor fig 1 Take off gear change pedal With the 14 mm open ended spanner or socket spanner slacken hexagon nut Remove serrated washer draw pe dal and spacer ring from gear change spindle fig 2 Not applicable to en gines with manual gear change Take off fan casing cap first remov ing two cylindrical screws M 5x 15 fig 3 Remove cylindrical screws M x 45 from the left side of the fan casing then take casing off fig 4 i P b Taking off Casing Cover left and Kickstarter Assembly With a 10 mm socket key take off 2 hexagon screws M 6x35 then remove left hand casing cover complete with kickstarter kickstart er spring and cover plate which also acts as the kickstarter stop fig 5 On air cooled engines slacken 2 cylindrical screws M 6x 45 instead of the hexagon screws men fioned above Toke the 4 cylindrical screws 5x20 off the flywheel magneto then remove fon Dismantling Ignition System Holding the flywheel firmly with ser vice tool SK A 251 take off the wheel nut with the 14 mm socket spanner fig 7 Fit press off bolt SK A 263 to wheel hold assembly firmly in position with tool SK A 251 and press wheel off the magneto spindle on the crankshaft Remember the key which secures the wheel to the crankshaft fig 8 Fig 5
21. fig 35 Fig 35 Taking off Steel Ball Selector on engines with manual gear change Bend up the tab of the washer se curing the locknut of setscrew a Slacken nut turn setscrew until selector fork b can be swung away and selector c can be taken out fig 36 2 Engine Assembly Before assembling the engine first clean all parts thoroughly remove the sealing compound from casing rim surfaces and check that all parts and sealing faces are in perfect condition Replace defective or damaged parts with Original ZUNDAPP Spare Parts Gaskets and sealing rings must always be replaced by new ones Make sure that all parts such as spindles shafts and bearings are pressed home all the way to the stop in their locating bores seats etc To fit a ball bearing always heat its housing to ap prox 85 C Coat the sliding and stop faces of all moving parts with a generous film of oil using only the grade and type speci fied by us Clean all metal filings off the magnetic plug in the right hand cosing 17 www oudebromtiets nl Setting Steel Ball Selector on engines with manual gear change On engines with manual gear change set the steel ball selector with the setscrew so that the spheri cal part sits exactly in the centre of the selector shaft bore correspond fex ing to the highest gear 3rd or 4th Use setting gauge SK A 232 3 speed to carry out the adjustment fitt ing it into the bearing
22. i plate Multi plate Multi plate Multi plate Multi plate Multi plate OilbathType OilbathType Oilbath Type OllbothType OilbathType Oilboth Type www oudebromfiets n Sport Co KS50Super KSSOSuper KSS0Super 100 ScooterR50 Scooter RS50 515 041 515 002 515 061 515061 514320 591 003 561 004 06 267 032 276 002 276 026 276 026 281 320 26700 2700 276 4 n WZSTI W260T1 W260T1 W260T1 W2601 225 1 W260T1 2 257402 2407402 2607402 2607402 2601402 2251402 2607402 05 04 04 04 BE 04 04 w 6757 6V2505W amp V2505W 6V2505W 6V2525W 6Vh5W 6 V2525 W D saw 6VISW 6Vi5W VIEW 6VISW 6visw 6vi5w 8757 Bell Buzzer Buzzer Buzzer Horn 17W Bell Buzzer 1 3636 13636 13636 12466 13636 122058 12058 12058 12058 11 28 11 363 13368 13368 14 000 1 1080 1 1080 I 1362 1354 1254 12600 12649 12684 b 11221 1201 1291 12475 11597 13519 134445 1432 1432 1977 13041 13006 1405 105 1774 1438 1423 1438 1 423 12785 1433 lote Muliplote Mulicplale Multi plate Multi plote hype OilboihType OlbehType OilboiType OilbathType Oilbath Type N f gt 9 000 www oudebromtiets nl
23. ide faces the gearbox Having fitted the cover plate run down the nut hold the assembly tightly with tool SK A 279 and tigh ten nut firmly fig Z3 Next insert the spring sleeves com plete with springs fit special ser vice tool SK A 234 as shown on fig 16 and insert thrust plate be tween clamping bolt of the tool and the clutch springs Press clutch springs together and you can then fit and tighten the 5 or 10 nuts M5 Take off the service tool fit thrust pin with the required packing washers to the thrust plate fig 74 29 www oudebromfiets nl Fig 73 Fig 74 p Setting Clutch Tongue and Clutch To obtain the largest possible re setting range the clutch tongue must be set to the mushroom shaped thrust pad To do this first coat the pad with chalk then fit the clutch bell cover and operate the clutch lever on the housing Take the bell cover off again check whether the thrust pad contacts the Tongue roughly at the centre If it does not re set with the setscrew for the thrust plote on the bell cover then secure the new setting Next check the clutch lever play at the housing In its rest position it should be possible to move the lever by hand about 2 3 mm in its bear d ing at the clutch tongue If Ihe play is too large or too small correct by fitting or removing the appropriate number of washers under the thrust pad fig 75 The following notes up to fig 85 apply on
24. il engine oil engine oil engine oil engine oil engine oil engine oil 221 261 261 271 231 251 wa 17764 11276 aneres 17 82 v w v 2 B 17 82 82 10 7 224 224 215A 2 4 220 215A 2 3 2 3 3 2 ae Bosch Bosch Bosch Bosch Bosch Bosch V w 6VNB 5W 6V 29 5W mm 18mm mm 1mm 12090 ll mm 5 045 035 045 035 045 sume 035 045 035 045 www oudebromfiets nl 5 Technical Data EE mes Super Co Super Co Super Co Sport Co Sport Co Sport Co 433 002 433 004 43302 515 008 515 004 515 041 Engine Model 267 003 267 004 267031 267 001 267 002 267 032 Spork Plug w25T1 w25T1 W25T1 W255T1 W25T1 W25T1 2251402 2251402 2251402 2251402 2251402 2257402 Spark Gap 05 05 04 05 05 04 Headlight Bulb amp VA5W 6VA5W 6VA5W 6VSW 6VA5W 6visw Rear Light Bulb 6 VBW 6vI8W Brake Light Bulk SVISW amp V5 w 6vISW 6VISW 6VISW 6 5 Flashing Direction Indicators _ z 5 T Signal Bell Bell Bell Bell Bell Bell Gear Ratios 1st Gear 12470 12470 12470 1 2470 1 2470 1 2470 2nd Geor 11476 11476 12476 14476 Saye 14476 3rd Geor 1 0962 10962 105962 1096 1 0962 1 0962 4th Geor E Overall Transmission Ratio 1st Geor 1269 1269 1369 1869 1369 1 369 2nd Gear 123 1221 1221 1221 123 1221 3rd Geor 11445 13445 11445 14445 13445 imas h Gear amp 2 Primary Reduction 1433 1438 1433 1433 1438 1433 Clutch Mult
25. in jet which will produce the highest speed on level road will be the most suitable for any machine But if on long continuous runs at full throttle the engine starts knocking due to overheating select the next larger jet size In the medium speed range carry out fine settings between two needle jet sizes by means of the needle By setting the needle higher the mixture will become richer and vice versa Note that needle position only affects the mixture ratio in the lower and medium speed ranges not for driving at full throttle If the carburettor is correctly set the insUlator of the spark plug will show an even brown combustion coating A spark plug coated with black coking residues or wet to the touch is a sure sign that the mixture is too rich a white insulator shows tha too lean Always remember that only correct carburettor setting guarantees maximum running economy www oudebromfiets nl Starter Systems To start a cold engine needs a specially enriched fuel mixture To supply this many carburettors have a separate starting system Starter Air Shutter see carburettor for R 50 and RS 50 On some carburettor types the starting aid consists of a pivoted shutter in the filter chamber operated by Bowden cable When the starter knob is pulled the shutter substantially narrows the carburettor cross section so that the mixture will become rich enough to stort a cold engine Starter Air Slide see carburettors for KS
26. ing pack ing washers until only play of maximum 0 3 mm remains Assembling Engine Block Fit selector shaft ond kickstarter spindle together with the packing washers determined by gauging and the main gearbox drive shaft with a standard 1 mm washer into the left casing Set brake spring so that when the two casing halves are fitted together the stop pin in the right casing can be introduced into the spring Locating stop on starter spindle must face bore mark ed x on housing fig 57 The assembly notes onthe locating stop of the star ter spindle apply only up to the engine numbers listed below Typ 267 Nr 3525493 Typ 267 R50 Nr 8000639 Typ 276 KS 50 Super Nr 4056928 Typ 281 KS 100 Nr 4601353 As from the succeeding engine num bers of the types listed and on all RS50 models right from the start the kickstarter stop has been trans ferred to the outside and is now located in the left casing cover Consequently the ossembly notes accompanying figs 93 95 apply 23 www oudebromfiets nl Fig 55 en ira aeae dotem Pana oa Fig 57 Fig 58 Press clutch gear if earlier taken off into right casing then secure it from inside with the snap ring see fig 33 the pre assembled right casing is shown in figs 24 and 26 Mount two press fit bushes coat casing contact faces with com pound such as Teroson Atmosit oil shafts and bearings then carefully fi
27. ly to engines with pedal gear change q Taking off and Mounting Pedal Gear Change Spindle The ossembly is shown in fig 76 Inside the pawl mount C are the 2 two georchange pawls D with spring Selector drum B engages over the pawls above the drum sits pawl deflector A with return spring The whole assembly is held by snap ring F In case of damage to the selector spindle we supply the complete assembly for replace ment but the return spring is avail able as a separate repair part fig 76 Fig 76 _ Www oudebromfiets ni The selector spindle comprises the following separate ports A Pawl deflector B Selector drum C Pedcl selector spindle D Selector pawl E Return spring F Snap ring G Spring H Oval head rivet l Compression spring J Stop pin fig 77 Clomp pedal selector spindle by the thread for the selector drum into a vice between a pair of soft metal pads then remove top snap ring fig 78 Span the selector drum with your hands from underneath so that as you lift it off together with the pawl deflector you will prevent the pawls from dropping out under spfing pressure fig 79 Fit selector pawls and pawl springs into the groove on the selector spindle Note that the large side faces on the tapered pawls should face the cylindrical pin in the pawl mount on the spindle fig 80 31 Fig 77 Fig 78 Fig 81 Fit the selector drum on to the
28. oat over flows Ignition cuts out Spark plug oily or coked up Starter piston not completely closed high fuel con sumption Engine runs properly but exhaust backfires Cause Ignition cuts out Mixture too lean Engine knocks or pinks Cause Too many early firings fuel is not of anti knock grade Exces sive compression Glowing coke de posits or parts of overheated spark plug produce faulty ignition Main jet too small Engine does not pull or does not give full performance Cause Mixture too lean or too rich Too few eorly firings Exhaust clog ged Piston leaks Intoke or exhaust ports clogged by coking deposits Air filter dirty Brakes drag Fric tion losses in transmission compo nents Float overflows Cause Foreign body carried in fuel to float needle seat and obstructs needle operation Float leaks Float needle jumped out of float spring or was wrongly mounted 5 Technical Data www oudebromfiets nl Super Co Super Co Super Co Sport Co Sport Co Sport Co 433002 433 004 433 022 515 003 515 004 515 041 Engine Mode 267 003 267 004 267 031 267 001 267 082 Cubic Copacity 50 50 99 so 50 499 gt Bore Stroke 39 418 8 39418 3948 3948 394A Compression 851 854 851 853 853 851 Capacity h p 26 25 24 26 26 26 RPM 4500 460 4830 4550 4600 4850 Mode of Operation 2stroke 2stroke 2 stroke 2 stroke 2 stroke 2stroke Georbox Oil SAE 80 SAESO SAEBD 80
29. of travel all the way to the stop crew on the setting dome running it down until it lightly contacts the face of the casing but without al tering the axial location of the spindle fig 88 Now draw the spindle to the right and turn the setting dome further all the way against the casing counting the quarter turns as you go Then turn the dome back by half the num ber of quarter turns counted and fix it to the casing with the screws provided fig 89 Mounting Cover over Clutch and Gear Selector Assembly Connector Cap Fit the cover and secure with the two countersunk fillister head screws M 5x 15 fig 90 Mounting Ignition System Fit baseplate and run down screws M 4x15 lightly only since these have to be slackened again when setting the ignition Then slide cable with rubber grom met into the opening provided on the casing remembering the igni tion cable clip Fit Woodruff key into its slot on the crankshaft then slide on the flywheel magneto Note Take care not to push the key out of its slot again Run down fixing nut and firmly tighten it with socket key holding the flywheel in position with service tool SK A 251 On engines of type 281 the baseplate is fixed with 3 screws fig 91 34 v Setting Ignition Timing Set contact breaker gap to 0 35 0 45 mm then with a dial gauge or similar instrument determine top dead centre Next turn flywheel magneto back in opp
30. onnecting I Assembling Piston and Cylinder m Mounting Chain Sprocket n Measuring Main Drive Shaft Position o Mounting aan e s eee Setting Clutch Tongue and Clutch 2 www oudebtbmfiets n 11 12 12 13 15 q Taking off and Mounting Gear ere Spindle r Mounting Clutch Bell Cover 2 s Setting Pedal Geor Change Spindle 1 Mounting Cover over Clutch and Gear Selector Assembly Connector Cap u Mounting Ignition System v Setting Ignition Timing w Taking off and Mounting Kickstarter Spring and Sleeve x Mounting Fan Left Casing Cover with Kickstarter and Fan Casing Bes E EL Loin Special Service Tools Bing Carburettors Technical Data Troubles and their Causes Beene 30 34 34 35 35 36 38 4l 48 49 Introductory Notes The comprehensive text of this extensively illustrated manual on engine dismantling and assembly applies with appropriate modifications to all models with manual or pedal gear change and kickstarter Where the assembly sequence differs in a few respects or where different tools are needed special reference is made to the changes in the relevant chapters The manual covers the following engine models Type Model Description Starting System Gear Change No of Gears System 267 Scooter R 50 Kickstarter Manual 3 267 Supe
31. osite direction to engine ro tation until piston has reached the position matching the specified ignition point Check the setting with a standard ignition tester or control lamp It is advisable to carry out a second check of the timing after baseplate screws have been tightened fig 92 Fig 92 For specified ignition timing see technical data w Taking off and Mounting Kickstarter Spring and Sleeve Take off snap ring lift cover plate on one side at the stop nose Gripp ing the kickstarter pedal lever firm ly you can now release the kick starter spring from load fig 93 Fig 93 Take off lever coniplete with sleeve and sealing ring from below lift cover plate with stop up and off The Kickstarter spring can now be replaced fig 94 Fig 94 www oudebromtiets nl Fig 95 Fig 96 Fig 97 Fig 98 www oudebromtiets nl Assembly of Kickstorter If the left hand casing cover had been completely dismantled first fit starter spring in such a way that seen towards the inside of the cover the spring can be tensioned anti clockwise Grease the spring well Then introduce the small stop nose of the cover plate into the inner spring loop and fit the sleeve kick starter pedal lever facing up through the plate from the other side remember checkplate between casing gover and sleeve Hold the casing cover with one hand then pre tension kickstarter spring by turning kicksta
32. pedal selector spindle pressing the pawls inwards as you do so The collar with the recesses acting as internal stops must face the cylindrical pin on the spindle Tilt the drum at a slight angle to make it easier to fit fig 81 To fit the return spring to the pawl deflector insert it with its top stop into the lower recess and with the bottom stop into the top recess of the pawl deflector The spring should be unloaded It is advisable to ease the spring into position with a pair of flat pliers to ensure that the stops enter the recesses far enough To turn the spring use only a screw driver pliers or similar tool To make the fitting easier you can use a second screw driver fo press the spring against the recesses in the pawl deflector as you coil and ease it into position fig 82 Next fit the pawl deflector com plete with return spring to the pedal gear selector spindle Note that the cylindrical pin in the pawl mount must be fitted through both arms of the return spring To check correct assembly fit assembly pin SK A 213 into the recess of the pawl deflector when you should be able to move the deflector to both sides under spring loading fig 83 Fit the snap ring into the groove on the spindle then turn the pawl de flector to expose the bore into which oval head rivet H compres sion spring I and stop J are fitted r Having fitted these parts in the se quence listed turn the deflector
33. r who has not yet had the opportunity to attend a training course will find the manual a useful aid and reference book Reproduction in whole or in parts prohibited except by prior authorisation ne Table of Contents Introductory Notes Deme gt 1 Dismantling Engine a Taking off Gear Change Pedal and Fan Casing b Taking off Casing Cover left and Kickstarter Assembly der S cai CUR TRUE MERC a c Dismantling Ignition d Taking off Clutch Cover Cover for Clutch and Gear Change Setting e Taking off Pedal Gear Change Spindle and Selector T a tizDismaptiingzClutdh ese 9 Taking off Chain Sprocket a h Taking off Cylinder and i Taking off Crank Casing 22222222202 k Taking off Bearings Bushes and Clutch Gear 1 Taking off Steel Ball Selector on engines with manual gear change ans Engine Assembly a Setting Steel Ball Selector on engines with manual gear change Rasen S TSS b Measuring Axial Play of Crenkshaft c Fitting Crankshaft into Right Casing d Measuring Axial Play of Selector Shaft e Measuring Selector Gears 2 2 2 2 f Measuring Starter 5 g Assembling Engine h Fitting Selector Shaft to Bearing on Left Casing i Mounting Sealing k Inspecting C
34. r Combinette Kickstarter Manual 3 267 Sport Combinette Kickstarter Pedal 3 276 Scooter RS 50 Kickstarter Manual 4 276 KS 50 Super Kickstarter Pedal 4 276 Scooter RS 50 Kickstarter Pedal 4 281 Motorcycle KS 100 Kickstarter Pedal 4 The instructions take account of all modifications introduced on engines supplied as from 1965 Complete dismantling of an engine is only called for in cases of damage to the gear box crank drive kickstarter assembly except for kickstarter spring or the manual gear change assembly Defects of the gear selector mechanism steel ball selector mechanism for pedal change engines clutch crankshaft drive gear of engines with either manual or pedal gear change can be remedied after taking off the clutch housing cover Con sequently the engine need not be taken off the frame But in all these cases the gearbox oil must be drained off through the drain plug in the bottom of the housing This is preferably done while the engine is still warm Gear change pedal kickstarter pedal with return spring chain sprocket flywheel magneto wheel and baseplate cylinder with piston cylinder head and fan assembly can all be taken off and fitted without dismantling the engine Here of course the oil need not be drained from the gearbox For air cooled engines consult the assembly instructions on model KS 100 and dis regard all references to the fan system www oudebromtiets nl Dismanting Engines Taking of
35. rs on small engines have no separate idling jet system instead the needle jet system provides the mixtures at all stages As engine speed increases the main jet system comes into action consisting of main jet mixing chamber insert or fixed atomiser and needle jet The exchangeable main jet sits in the nozzle block screwed from below or from the side on inclined jet carburettor designs into the carburettor housing On carburettors with fixed atomisers the main jet is screwed to the lower end of the needle jet As the main jet system comes into action the fuel flows via the main jet to the needle jet The outlet bore of the needle jet is located in the mixing chamber where the preliminary mixing of fuel and air takes place Here little fuel air bubbles form which are then mixed with the main air flow stream and drawn into the engine combustion chamber A tapered needle fixed to the throttle slide controls the available needle jet cross section Operation of the throttle slide drives the needle further into the jet thus narrowing the free cross section between needle jet bore and needle or vice versa draws the needle further out and thus increases the cross section The needle shank has several grooves so that the needle can be re set in relation to the throttle slide If the setting is altered so as to drive the needle deeper into the bore the engine is supplied with a leaner mixture If the needle is set higher on the throttle sli
36. rter pedal lever through about 1 revolution until the stop nose lies just in front of the top stop on the casing Finally fit the snap ring fig 95 Mounting Fan Left Casing Cover with Kickstarter and Fan Casing Fit and bolt fan to flywheel magne to with 4 cylindrical screws M 5 x 20 fig 96 The following can only be carried out after engine has been fitted into frame Fit casing cover on left and bolt down with two hexagon bolts M6 x 35 fig 97 On air cooled engines fit 2 cylindrical bolts M 6 x 45 Fit sealing ring of pedal gear change spindle into sleeve of kick starter using sleeve MV 6 1563 and hollow punch MV 6 347 fig 98 36 Mount fan casing bolting it to the left casing cover with 3 cylindrical screws M 6x 45 fig 99 Fig 99 Bolt on fan cap with 2 cylindrical screws M5x 14 Note Check that the 2 rubber buffers are fitted inside the fan cop fig 100 Fig 100 Fit gear change pedal in this se quence Bush spacer ring Lever with pedal Serrated washer Hexagon nut Plastic pedal cover sleeve fig 101 1 Refill gearbox with oil see technical dato Fig 101 www oudebrom iets ni 3 Special Service Tools Illustr Order No SK A 126 SK A 251 N XKg c v nv03g 70 020oco al bl cl to be made in own workshop di to be made in own workshop el to be made in own workshop mm Description Engine clamping fixture Fl
37. system Before fitting the fuel hose first allow a little fuel to run through it to drive out all the air and prevent the formation of bubbles and an airlock in the system Special Hints 1 The carburettor is one of the most delicate parts of the engine Handle all parts with great run down all threaded connections lightly never use force to fit any parts of the float into position 2 Do not use hard sharp tools to clean the jets On no account enlarge nozzle bores with a reamer or by any other means 3 Fit only Original BING spare parts to ensure troublefree operation and a long service life 4 Imall your spare part orders quote part No accurately and full If the num ber is not known quote the carburettor type code stamped into the casing or send old part as a sample 5 BING carburettors will give excellent service at all times provided standard good quality branded fuels are used carburettors kept clean and only Original BING spare parts are fitted www oudebrdfidets ni 66 Carburettor Setting Manufacturers of carburettors work out the most suitable design and select the jet sizes in close collaboration with the engine makers They also specify the setting which tests have shown to give best performance and maximum economy It is there fore inadvisable to depart from their specifications Idling Idling speed should always be set or regulated while the engine is warm With the
38. t both casings together taking care to position the broke spring correctly It is advisable to lift the starter spindle up from underneath until the stop pin engages with the brake spring so that the spring cannot shift out of position as the two casing halves are fitted toge ther fig 58 Bolt cosing halves together on the left with 2 bolts M 6x 35 at the fly wheel magneto side and below the starter spindle b fig 59 On the right hand fit 1 bolt M 6x50 at the cylinder base shown by arrow on fig 26 24 h Fitting Selector Shaft to Bearing on Left Casing Fit 1 ring made in your shop of the following dimensions Height 6mm Outer dia 36mm Inner dia 3 mm on to selector shaft flush against the casing Fit chain gear and tigh ten gear nut to shift shaft upwards bringing its collar all the way against the inner race of the ball bearing Fig 60 Take off nut chain gear and ring again fig 60 On engines of type 267 use spacer ring SK A 138 for driver in place of the ring just mentioned Hoving fitted the ring fit and run down chain gear nut only Check that all shafts move smoothly i Mounting Sealing Rings Fit engine into service fixture SK A 126 and clamp the whole assembly into the vice Fit sealing ring to left casing fil sealing ring for crankshaft with punch MV 6 961 Fit sealing ring for selector shaft with assembly socket sleeve SK A 217 and drive it home b
39. the crankshaft flats then with the 19 mm spanner take off the hexagon nut and pull off the wheel Note Take care not to loose the two 5 mm balls underneath the gear fig 23 If the drive gear cannot be pulled off by hand use a standard two orm puller tool fig 24 13 www cudebromfets nl Fig 21 Fig 22 Fig 23 Fig 24 Fig 25 Fig 27 Fig 28 Www oudebromfiets ni Take the remaining screws from left hand casing 2 in magneto section M6x35 a and 1 under starter spindle M x 65 b fig 25 On the right hand side take one screw M 6x 50 off the base of the cylinder fig 26 Engines 267 and 276 Fit service clamp SK A 234 by 2 stud bolts M 8 SK A 246 and 1 locating bolt SK A 123 on the left hand side above the magneto spindle fig 27 For engines 281 make your own press off fixture and secure it with three 8 mm screws SK A 246 to the left hand casing above the magneto spindle The diameter should be 6 in 150 mm thickness 7 mm bore 9 mm to take the 8 mm bolts see special tools fig 28 14 k Take the georbox block from its mounting frame and place it right hand side facing down on two wooden blocks Turn the press off bolt and at the some time press on selector and starter shafts to prize the two gearbox halves apart Then carefully lift off the top half left fig 29 Befor taking out the various shafts note the position and numb
40. y topping with punch MV 6 734 On engines of type 267 manual and pedal gear change use socket sleeve MV 6 960 together with punch MV 6 961 Fit sealing ring for kickstarter spindle with hollow punch MV 6 734 noting that chamfered side of ring must face casing fig 61 Fig 61 www oudebromtiets 25 k Inspecting Connecting Rod Fit gouging ring SK A 125 needle bearing and gudgeon pin into con necting rod Turn crankshaft down until gudgeon pin lies against gaug ing ring Check that it contacts flush on both sides fig 62 Gauge in turned over position and Fig 62 compare results Adjust connecting rod as shown in fig 64 On engines of type 281 place two gauging bars SK A 161 on both sides of the connecting rod on the casing face accommodating the cylinder base gasket Turn the crankshaft until the piston rod edge lies aginst the bars Then repeat the gauging in the opposite position Adiust the connecting rod as shown Fig 63 in fig 63 Carry out final connecting rod sett ing with the setting bar MV 6 116 fig 64 Assembling Piston and Cylinder Fit the piston the mark Auslass xhaust port must face towards the exhaust Introduce gudgeon pin with service tool SK A 163 fit crankshaft cover then fit retaining rings Position cylinder base gasket but without sealing compound fig 65 On engines of type 281 use tool SK A 272 to fit the gudgeon pin 26
41. ywheel magneto key Press off bolt Clamp Studs Clamping stud 8 long Assembly ke tor gudgeon pin Press off tool for gudgeon 75 and 100 cc Stud Supporting pin Setting sleeve 3 speed engines Clamping snap ring Gauging bar Gauging yoke ig place of SK A 161 Assembly socket sleeve for selector shaft Spacer ring for driver Ring gouge Mandrel Mandrel 100 cc Assembly sleeve Hollow punch Hollow punch Hollow punch Mounting sleeve Aligning bar Sleeve Press off plate Ring for selector shaft Spacer sleeve For use see fig No 1 28 61 96 7 8 91 8 98 28 sketch on p 39 60 sketch on p 40 37 38 sketch on p 40 Thrust bolt b Hexagon nut welded on c Steel grade 37 K d Cylindrical pin e Pressure pad 8 Ring for Selector Shaft 312 36 Spacer Sleeve 2 14 www oudebromfiets nl _ 4 BING Carburettors Operation The carburettor is designed to supply the engine with the correctly proportioned and thoroughly mixed fuel air mixture to match any load The mixture is prepared in one idling and one main jet system The idling jet system supplies the engine at the lower speed stages It consists of the idling fuel jet the idling air jet and the air adjuster screw If the air inlet is partially throttled with the adjuster screw the idling mixture becomes richer if more air is admitted the mixture becomes leaner Carbureto
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