NORSWIFT 60cc - Stian Sørlie Motorsport
Contents
1. j The heart of kort NORSWIFT 60cc ASSEMBLY INSTRUCTIONS amp USER MANUAL MAN O7 1 INDICE GENERAL DESCRIPTION OF ENGINE ENGINE CHARACTERISTICS OPERATIONAL LIMITS l 2 3 ON O QO Contents of packaging Engine Identification Number Preparation and installation of the engine on the chassis 3 1 Exhaust Header Assembly 3 2 Preparation and installation of the motor mount 3 3 Assembling the carburettor 3 4 Installation of the carburettor 3 5 Install the engine on the chassis 3 6 Install the clutch cover 3 7 Electrical connection 3 8 Install the intake silencer 3 9 Install the exhaust system Gasoline and Cil Carburettor Adjustament guide Starting and Stopping the engine Engine Breaking In Inlet Silencer Recommendations on the exhaust system 10 11 12 13 Scheduled Maintenance 15 16 17 Centrifugal Clutch Instructions for the disassemblv Assembly of the Clutch Spark Plug Thermal Degree Choice of the best sprocket ratio Troubleshooting Engine Preservation Fasterner Torque table N PAG OONOO ao BR N N MAN 071 GENERAL DESCRIPTION OF ENGINE This engine is for propaedeutic series and for young drivers and has been specificallv designed and developed for powering of kart either for racing purposes and hobby but always on closed tracks During the design phase has been inspired to the technical solutions already adopted2. Check the clutch Every 5 hours of use When metallic noises are heard from the clutch It the kart first dragging speed exceeds 4000 RPMs Every time the clutch has overheated presence of smoke or smell of burning Clutch rotor and internal part of clutch drum must always be clean and dry Please degrease carefully the working surface every time you reassemble the clutch Please pay attention when lubrificating the chain no chain lube must enter the clutch To check the clutch you must remove the clutch cover and the clutch drum Replace the clutch f the body diameter is lower than 83 3mm 15 MAN O7 1 11 INSTRUCTIONS FOR THE DISASSEMBLY ASSEMBLY OF THE CLUTCH AN ATTENTION The following operations must be performed by a skilled mechanic under the condition to have available the dedicated fools shown on the text otherwise if is necessary to fo an Authorized Service Center Refer to the following drawing during the operations Drum nut 9 Clutch body External washer 6 Internal Washer Roller cage 7 Locking nut Clutch drum Sprocket 8 Cone safety washer Clutch disassembly OPERATIONS TOOLS 1 Remove clutch cover 3 screws M Allen wrench 5mm T type 2 Using the special tool S 1436 2 or clutch wrench Clutch wrench CH 24 CH 24 and hooking itself to the clutch body for Special tool 5 1436 2 blocked the crankshatt 3 Remove drum nut 1 nut MIO 12 Point wr
3. INSTALL THE INTAKE SUPPORT N 2 SCREWS M5x10 SEE FIG 10 ALLEN WRENCH 3mm INSTALL THE CARBURETTOR REMOVE THE N 2 M NUTS REMOVE THE PLASTIC CAP KEEPING 1 CARBURETTOR GASKETS ON THE ENGINE INSTALL SEE FIG 11 12 N 2 THERMICAL SPACER N 2 CARBURETTOR GASKET CARBURETTOR N 2 NUTS M TORQUE AT 6 10 Nm 50 90 in lb 12 POINT WRENCH 10mm CONNECT BY APPROPRIATE PIPE THE INTAKE PRESSURE MANIFOLD ON THE CARBURETTOR AND THE INTAKE PRESSURE MANIFOLD ON THE CRANKCASE SEE FIG 13 8 MAN O7 1 POSITION THE ENGINE ON THE 2 MAIN RAILS AND FIX THE MOTOR MOUNT WITH THE TWO CLAMPS SEE FIG 14 SUGGESTION NEVER TORQUE COMPLETELY THE CLAMPS NN UNTIL THE CHAIN IS INSTALLED AND PROPERLY ALIGNED CHECK THE ALIGNMENT OF THE ENGINE SPROCKET AND THE AXLE SPROCKET WITH A STRAIGHT EDGE SEE FIG 15 INSTALL THE CHAIN PITCH 7 775mm SEE FIG 16 MOVE THE ENGINE THE RAILS AND OPTIMIZE THE CHAIN TENSION A TTENTION THE PLAV OF THE CHAIN MUST BE APPR 15mm 13 34 inch MEASURED IN THE SHOWN POINT SEE FIG 17 MAN O7 1 INSTALL THE CLUTCH COVER REMOVE THE 3 SCREWS M6x30 ON THE CRANKCASE SEE FIG 18 AND INSTALL THE CLUTCH COVER SEE FIG 19 TORQUE THE 3 SCREWS 8 10 Nm 70 90 5 mm ALLEN WRENCH ELECTRICAL CONNECTION CONNECT THE COIL CABLE SMALL ONE TO THE TERMINAL ON THE COIL SEE FIG 20 CONNECT THE COIL C
4. 500 RPM Engine max orocket ratio used durinc afa e e o e ete Cc Lem frat em nm 830 rt N xo y e e e amp N gt N os e Qo p 5 N amp 5 8 co lt e h N co O amp 5 8 8213 P co pa N z NIN tn wl o N ES wN w A gt 2 m e N O 5 cO win 5 y cO N w BB 75 62 7 49 7 96 83 70 58 41 Co N HE J sel co pe J N co ig C 74 C2 w N N wo o ma 99 96 14 7 81 7 69 7 58 7 77 65 N N e co ai y N w N N N To co e e wim gt N JBE 2888 j e o e S s M o A N gt NIN SB NINN J y co 7 89 8 8 8 8 e E e JH i N P SEE 5414 2 8 SERE eo Da Cn wl gt N reer 109 as var vss um 6 81 6 99 7 7 18 7 73 7 91 8 28
5. for high performance engines kart to its simplicity of installation and use related to a parsimonious maintenance in order to ensure the maximum durability and reliability of the components subject to compliance with the operational limits The engine is single cylinder and uses the principle OTTO two stroke The cylinder and the crankcase are made in aluminium alloy The pressed in lineris made of centrifuged cast iron fully machined from a solid to ensure the best stability and homogeneity of sliding The head is separated from cylinder and is secured to the cylinder with through studs The crankshaft is built and supported by ball bearings It s made of alloy steel hardened and tempered as well as the connecting rod which also undergoes a surtace treatment of copper plating which rotates on roller bearings on both sides The ignition system is of analogical type with discharge capacity is powered by a flywheel and a coil whose functions are to generate the spark energy required for a proper management of goodwill provide the references phase by a pick up integrated The plant comprises a rotor stator a high voltage coil which allow the control of the advance The engine is equipped with a pull starter Repeatedly pull the starter handle until the engine start The engine is also equipped with a centrifugal dry clutch with low maintenance with incorporated sprocket The carburettor type is a diaphragm series Tillotson HL
6. from oil deposits If necessary remove the rubber intake silencer and clean the interior silencer with gasoline or solvent N ATTENTION In case of rain if is necessary to protect the vertical hole of Intake Silencer with the water roof plastic cover as otherwise water by entering the engine could damage the internal components of engine When weather is good remove the cover 14 MAN 071 9 RECOMMENDATIONS ON THE EXHAUST SYSTEM Alwavs make sure that the springs are well hooked to the manifold and in place In case ot breakage replace the broken spring Never race the kart without the 2 springs in place as otherwise the exhaust pipe could vibrate bevond control Every 10 15 hours open the exhaust muffler end and make sure that the holes on the rear cone are not plugged 10 CENTRIFUGAL CLUTCH The engine has a low maintenance dry centrifugal clutch steel on steel The following prescriptions if carefully followed will allow a long clutch life AN ATIENTION When starting the engine make sure that the brake pedal is fully pressed to avoid sudden accelerations Once the engine is started and kart is still avoid useless accelerations which can overheat and deteriorate the clutch early lubrificate the chain before each test immediately after each session and check the engine sprocket Replace if necessary A bad alignment between engine and axle sprockets or lack of lubrification will damage chain and sprocket
7. to Switch J Sparkplug NGK BR 9 EG 1 MISCELLANEUOS Chick Cover 2 MAN O7 1 ILLUSTRATION OF ACCESSORIES SPARK PLUG NGK CLUTCH COVER INTAKE SILENCER 4 FIXING CLAMP COIL SWITCH CABLE COIL WITH SPARK PLUG CAP 3 MAN O7 1 2 ENGINE IDENTIFICATION NUMBER The official identification number can be found stamped on the left lower part of the crankcase pull start side next to the coil see picture The number normallv includes a letter followed bv 4 digits Other numbers stamped on the crankcase or other surfaces refer to various manufacturing processes and do not identity the engine NOTE In case of need for spare parts and when contacting the IAME Support Centers please always supply to the Engine Identification Number and model 4 MAN O7 1 3 PREPARATION AND INSTALLATION OF THE ENGINE ON THE CHASSIS NOTE In case the engine is supplied already assembled on to the chassis if is at care of the assembler to follow these instructions The final customer in this case can skip this section and can start reading from section 4 Whenever the engine or a component is disassembled if is necessary fo always follow the under shown instructions for proper reassembly EXHAUST HEADER ASSEMBLY NOTE THE ENGINE IS SUPPLIED WITH THE EXHAUST GASKET AND NUTS ALREADY INSERTED WHEN THE SHIPMENT IS MADE AN EXHAUST COVER GASKET IS PROVIDED TO PROTECT THE INTERNAL PARTS REMOVE THE EXHAUST COVER GAS
8. 6 71 6 89 7 07 dam 7 62 7 80 8 16 8 34 20 MAN O7 1 14 SCHEDULED MAINTENANCE Following some simple maintenance standards will allow to perform more reliably and guarantee a longer engine life SCHEDULE COMPONENTS ACTIONS AND COMMENTS Before using Check status and fixing Engine sprocket Check wear Check alignment with axle sprocket Engine chain Check wear tensioning and oil chain Cables and connectors Check status and connections Engine mount and clamps Check torques After use Check status and oil chain Engine External cleaning Engine used in rain conditions Clean carefully the engine interior and the clutch after lubrificate 5 10 hom Engine head Open clean Everv 20 hours see maintenance program 21 MAN O7 1 15 IROUBLESHOOTING Below are some common faults their probable causes and suggested remedy FAULTS PROBABLE CAUSE REMEDY Turned on the ON position the When pulling the handle don t start Not turned on the ON position the engine the switch switch Check and restore Bad connections cables engine chassis body failure Wet spark plug Malfunction on fuel feed system Check status and connections on tuel pipe including dip pescante Replace gaskets and membranes on carburettor The fuel don t arrive to carburettor Check the carburettor pipe connections and replace the pipe if necessary Bad carburettor adjustment C
9. ABLE AT THE TERMINAL ON THE ON OFF SWITCH SEE FIG 21 INSTALL THE SPARK PLUG ON THE CYLINDER HEAD AND INSTALL THE SPARK PLUG CAP MAKING SURE THAT THE SPARK PLUG CAP IS WELL INSERTED IN THE SPARK PLUG SEE FIG 22 HEXAGONAL PIPE WRENCH 20 8 TOURQUE SPARKPLUG AT 20 26 Nm 175 230 in lb MAN O7 1 INSTALL THE INTAKE SILENCER AND THAT THEY ARE NOT PLUGGED SEE FIG 23 TIGHTEN THE FIXING CLAMP ON THE CARB AND SUPPORT THE INTAKE SILENCER PROPERLY SEE FIG 24 INSTALL THE EXHAUST SYSTEM INSTALL THE EXHAUST MUFFLER ON THE MANIFOLD AND SECURE IT WITH THE 2 SPRINGS Y 4 gt SEE FIG 25 i lu P a 4 4 A 4 H E G d 4 EN l THE ENGINE IS READY STARTED 11 MAN O7 1 4 GASOLINE AND OIL Use leaded or unleaded gasoline with minimum 95 ROM mixed with oil at 396 33 1 Use oils containing ricinoleate which ensures optimum lubrication at high temperatures As on the other hand use oils containing ricinoleate creates gummv residues which give origin to carbon deposits it is necessarv to check and clean at least every 5 10 hours the piston and the cvlinder head Our experience dictates use of oil such as e WLADOIL RACING K2T Once the fuel tank is filled make sure that the gasoline reaches the carburettor before starting the engine ADVISE Disconnect the plastic tube fr
10. KET AND THE NUTS INSTALL SPRINGS ON THE EXHAUST HEADER SEE FIG 1 MAKE SURE THAT THE EXHAUST GASKET IS IN SEAT AND INSTALL THE EXHAUST HEADER SEE FIG 2 INSTALLTHE 2 WASHERS mm SEE FIG 3 SUGGESTION PUT THE ENGINE IN HORIZONTAL POSITION USE SCREWDRIVER IF NECESSARY AND INSTALL THE WASHERS IN SEAT 5 MAN O7 1 INSTALL THE 2 NUTS aa E ENEO sak SEE FIG 4 1 T TORQUE AT 9 11 Nm 80 100 inb dX gt T WRENCH 10 mm i M y PREPARATION AND INSTALLATION OF THE MOTOR MOUNT NOTE ALL THE DIMENSIONS ARE IN MILLIMETERS 013 5 14 _ 08 25 8 5 JNSTALL THE MOTOR MOUNT MAKE SURE TO 2 USE M8 ALLEN SCREWS WITH A LENGTH SUCH AS TO ENGAGE IN THE CRANKCASE A THREADED PORTION LENGHT 16 19 SCREW MUST PROTRUDE FROM THE PLATE FOR 16 19mm SEE FIG 5 AND DRAW 4 ALLEN SCREWS M8 TORQUE 22 24 Nm 190 210 in lb 6mm ALLEN WRENCH 6 MAN O7 1 INSTALL THE GAS CABLE CLAMP ON THE SUPPORT SEE FIG 6 12 POINT WRENCH 10mm REMOVE THE 2 SCREWS 3 5mm ON THE CARB PUMP IN CORRESPONDENCE OF THE GAS CABLE BRACKET SEE FIG 7 SCREWDRIVER 4 8 mm TORX TOOL T20 SCREWS AND TIGHTEN SEE FIG 8 INSTALL THE THROTTLE CABLE SPRING ON THE CARBURETTOR SEE FIG 9 f THE GAS CABLE BRACKET THE 2 Fig 8 MAN O7 1
11. NER NAME WRENCH VALUES Nm VALUES in ib M14 x 1 25 1 Spark plug Hex 20 8 20 26 175 230 M8 x 1 25 Head nut 18 22 160 190 M6 x 1 Exhaust monifold nut 80 100 M6 x 1 2 Carb fitting fixing nut 80 100 17 17 11 45 50 45 50 t ignition rotor fixing nut Hex 17 20 26 175 230 Pulley Fixing Screw 70 90 70 90 Clutch fixing nut 575 665 70 90 90 120 23 MAN 071
12. dle d CO W Nacional Tor Trigger accelerator decreases Slowly adjust clockwise increases rich idle Trigger accelerator Engine is now idling at max attainable R P M or slightiv lower on rich side Adjust counterclockwise until 2000 2500 R P M is reached Recheck L screw for optimum setting required Adjust H until best possible free speed is reached Turn clockwise for higher R P M Counterclockwise for lower R P M Adjust L slightly richer by Return to idle and check acceleration for MN 1 8 1 4 T O acceleration quick response and smooth pick up acceleralion Engine is ready to operate 13 MAN 071 6 N STARTING AND STOPPING THE ENGINE The engine is started by pulling the handle that uncoils the rope The rope rotates the pulley that engages the ignition flywheel connected to the crankshaft This action made with the appropriate energy and eventually repeated if needed starts the engine First of all the switch located on the right side of the engine and mounted on the bracket attached to the clutch cover must be turned on the ON position Following grip the handle of the starter slightly pull the first stroke of the rope and then pull it firmly exploiting the stroke provided by rope WARNING do not pull the rope to stroke end to avoid recoiling problems As soon as the engine starts gently drive the rope back to its position returning the handle in its seat In the event of s
13. ench 17 mm 4 Remove the external washer the drum with roller cage the O Ring and the internal washer 5 Using the special tool and the clutch wrench CH24 Clutch wrench CH 24 remove the M16x1 nut and the cone safety washer Special tool 5 1436 2 AN ATTENTION Turn clockwise as nut has leff thread Apply clutch puller on clutch and remove clutch from Clutch puller B 55614 C the crankshaft with 12 point wrench 19mm 12 point wrench 19mm 7 Remove key from shaft 16 MAN O7 1 Before assembling the clutch degrease with diluent the shaft taper the conical hole on the clutch body the clutch drum Clutch reassembly a 1 Insert key on shaft 2 Install clutch body and cone safety washer on shaft 3 Install the M16x1 nut using the clutch wrench Clutch wrench CH 24 Special tool S 1436 2 AN ATIENTION turn counterclockwise as nut has left torque at 65 75 Nm 575 665 indb thread 5 Install the internal washer and the O ring A ATTENTION install washer with chamfer towards internal part of engine Clean the roller cage and grease it before installing on the crankshaft 1 Install the clutch drum and the external washer ANA TTENTION install washer with chamfer towards 2 Using the special ics S 1436 2 or clutch wrench Clutch wrench CH 24 CH 24 and hooking itself to the clutch body for Special tool 5 1436 2 blocked the crankshaft install and tighten the 12 Po
14. end and electrodes covered with black symptoms listed aside shady soot 1 Ignition difficulties ATTENTION Note a wet or oily electrode could also mean Use a colder spark plug with hot climates an excessively rich mixture COMPARISON TABLE BASED ON THE THERMAL DEGREE HOT COLD 18 MAN O7 1 13 CHOICE OF THE BEST SPROCKET RATIO The life of an engine depends upon mony factors but most of all upon the speed at which the engine is operated If an engine is normally operated at speeds higher than what recommended by the manufacturer the wears and stress of the various components con rods roller cages bearings etc will be such as to drastically reduce the life of the engine itself It is therefore extremely important that the user respects the operating limits imposed by the manufacturer The operating limit for the NORSWIFT engine is 12 500 RPM ATTENTION Never exceed the above limit No obligation of IAME exists in case the above limit is exceed In case the user wishes to optimize on the track the sprocket ratio in order to achieve the best possible performance without abusing the engine follow the under shown recommendations The engines are supplied with a 11 teeth sprocket pitch 7 775mm and you can also use 10 teeth sprocket Table 1 shows the various ratios between the sprocket on the axle and the engine sprocket given the different axle sprockets Tab 1 Sprocket ratio Teeth n E
15. everal void starting attempts check that fuel is arrived to the carburettor In the event that the engine can not be started refer to Sect 15 Troubleshooting The engine is stopped by simply turning the switch on the OFF position ENGINE BREAKING IN The breaking in of the engine must be performed following a few fundamental rules Adjust the carburetion Start with an adjustment on the rich side 2 Warm the engine gradually for about 5 minutes at half throttle making some laps at low speed gently closing and opening the carb throttle if a tachometer is installed never exceed 8 000 RPM Never keep the same RPM for a long time 3 Progressively increase the speed of the kart for 5 minutes at 3 4 throttle opening Never keep the same RPM for a long time 4 Increase the speed for 5 minutes at max speed on the twisty parts of the circuit and making the engine rich at half straight cover with the hand for an instant the holes on the air filter keeping the throttle wide open AN ATTENTION Once the break in is over and the engine is cold check the torque of the exhaust header nuts as during the break in the nuts tend to loosen refer to the attached table INLET SILENCER Make sure that the inlet hole on the filter is towards the upper side and that it is not plugged Make sure that the clamp on the carburetor is not loosen and the intake silencer is well fastened to the chassis Once a while clean the inside
16. heck carburettor adjustment see H screw Sect 5 Breaking of starter rope Replace rope Bad carburettor adjustment Check carburettor adjustment see L screw Sect 5 Drop in engine performance Bad compression Check piston Bad carburettor adjustment Check carburettor adjustment see Sect 5 Insufficient fuel flow Check fuel flow lines Dirty inlet silencer Check and clean Burning smell clutch smoke Overheating of clutch Check clutch Sect 10 11 Lubrificant accindentaly entered Check clutch Sect 10 11 into the clutch Cluth engages at too high RPMs Excessive wear of the clutch Check clutch Sect 10 11 Lubrificant accindentaly entered Check clutch Sect 10 11 into the clutch Cluth engages at Too Low RPMs or Clutch body is deformed of failure Check and replace Sect 10 11 Clutch always engaged Clutch body disassembled Check and replace if necessary assembly no correct Sect 10 11 Pullstart malfunction Exhaust too noisy Check and replace if necessary Damaged exhaust muffler 22 MAN O7 1 16 ENGINE PRESERVATION 17 When engine has to remain unoperative for a long period it must be preserved as follows Disconnect carburettor and clean it Seal with tape the engine inlet and exhaust The external of the engine must be cleaned Spray with protective oil the steel parts subject to oxidation Keep the engine in a dry ambient FASTENER TORQUE TABLE NOMINAL SIZE FASTE
17. includes an integrated fuel pump and filter and is able to operate in any position The exhaust system including in the supply is already tuned and optimized to ensure the best possible performance 1 MAN O7 1 ENGINE CHARACTERISTICS The Characteristic of the engine are the following Cycle OTTO 2 Stroke Single Cylinder e Original cubic capacity 59 42 cm 60 00 cm max e Original bore 41 80 mm e Max Theorical bore 42 00 mm e Stroke 43 30 mm lwbrification Fuel oil mix oil 396 Inductiion Piston Port e Carburettor Diaphragm type Tillotson HL series Cooling Air Ignition Analogical Clutch Automatic 3 mass Centrifugal Drv e Starting Pull Start OPERATIONAL LIMITS Max RPM 1 12 500 RPM Without limiter AN ATTENTION Never exceed the above limits no obligation of IAME exists in case the above limits are exceeded 1 CONTENTS OF PACKAGING Each engine NORSWIFT is supplied with the accessories shown below EXHAUST GROUP e Exhaust Muffler Springs e Exhaust Manifold No restricted OR with restrictor 012 5mm e Exhaust Muffler Tillotson HL series Carburettor O19 8mm 16mm restricted e Intake Silencer with Fixing clamp e Intake Silencer Support e Gas cable bracket with accessories e Thermal Spacer Gaskets Fuel Pipe ELECTRIC GROUP e Coil Assembled on to the engine e Kill Switch Switch Bracket Assembled to the engine e Connective Cable Coil
18. int wrench 17 mm M10 nut torque at 30 40 Nm 265 350 in lb 3 Install the clutch cover 3 screws M Allen 5mm torque at 8 10 Nm 70 90 inb 17 MAN O7 1 12 SPARK PLUG THERMAL DEGREE The engine is supplied with a standard BR9EG spark plug which represents a good compromise between the needs of a good break in and the racing needs in normal conditions The colour of the various parts of the spark plug more exposed to the combustion flames gives a good indication on the adequacy of the thermal degree and on the carburetion It is necessary though to understand which of the two parameters has to be changed and only the experience tells how to identify the most proper thermal degree of a spark plug as lean or rich mixtures can generate the same final look which can be also achieved with a hot or cold spark plug See table an excessively warm spark plug shows the Extremely clear color porous look and symptoms listed aside calcification of the electrodes and of the internal insulator ATTENTION Irregularities in the ignition preignition and Use a warmer spark plug with cold or rainy detonation with tendency to perforate the top of the climates piston u Note some of these symptoms can be achieved also with lean mixtures A correct thermal degree shows Color of the insulator end from yellow grey to dark brown for mixtures respectively lean or rich An excessively cold spark plug shows the K Insultator
19. ngine sprocket Sprocket ratio Teeth n Engine sprocket E da sprocket sprocket 7 20 6 55 8 30 7 55 _ 32 80 745 For the operation limit of 12 500 RPM the following table tab 2 has been prepared 1 1 83 84 85 87 88 9 92 77 70 70 8 380 580 72 73 74 75 76 77 78 79 81 82 SUGGESTION During the track tests we recommend use of a tachometer recording the max obtained engine RPM Use spark plug caps with a resistance of 5KQ to avoid eventual interferences between the engine ignition and the tachometer and or telemetrv 19 MAN O7 1 The following example should clarifv the procedure for the optimization of the sprocket Assume to use the engine with 7 10 teeth engine sprocket and that during the preliminarv track tests a Z 72 teeth axle sprocket has been used From table 1 with Z 10 as engine sprocket and Z 72 on the axle sprocket a ratio of 7 20 is tound Make a few laps on the track and let us assume that you read 11 000 max engine RPM From the table 2 to achieve a max RPM of 12 500 RPM operating limit for the NORSWIFT engine a sprocket ratio from 8 08 and 8 31should be used having used during the tests a sprocket ratio of 7 2 and having achieved 11 000 RPM max From table 1 with these values a sprocket ratio of 10 81 10 83 should be used or having a Z 11 on the engine sprocket a ratio 11 90 should be used Tab 2 Sprocket ratio to achieve max 12
20. om the carburettor and pressurize the vent tube on the tank until gasoline comes out from the tube on the carburettor side Make sure there is no air in the tube Connect the tube to the carburettor 12 MAN 071 5 CARBURETTOR ADJUSTMENT GUIDE 1 THROTTLE SPEED SCREW H HIGH SPEED FUEL MIXTURE imam XN quer ot res TURNS OPEN Normally the correct setting of the mixture screws is the following close the screw completely and then open 1 00 T O for HL 334B and 1 00 T O for HL 394A adjust T O from closed to approximately 34 T O for HL 334B and 1 00 T O for HL 394A Based on various factors as altitude ambient temperature etc it might be necessary to adjust the carburetor to optimize the performance of the engine AN ATTENTION Never lean too much as lean mixture will overheat engine and cause seizure Do not force or L closed t may damage the precision machined orifice and make the carb unserviceable The screws adjustment must be performed with warm engine H L D Adjust T O from closed to 1 approximately 34 for Adjust T O from closed to approximately 22 UN CR HL 334B and 1 00 T O for 1 T O lavat HL 394A Start the engine and warm it If R P M too high adjust I counterclockwise until clutch is disengaged Continue to turn clockwise Turn c c w until max R P M i is reached Adjust further L nin hips ip lips fractionally for rich i
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