- RAD Paramotors
Contents
1. N P 32175 Oo 55165 25 Radne Motor AB Box 3035 136 03 Haninge Sweden Tel 46 8 556 506 90 Fax 46 8 556 506 91 info radne se http www radne se2. 32090 32091 32092 32093 32049 32112 32116 32143 32144 32144 1 32144 2 32147 32148 32151 32153 32156 32159 32160 32163 32170 32171 32172 32175 4118 Spring 40 mm Flex Silencer Silencer Catalytic converter Elbow vacum connection Exhaust gasket Screw 5x25 Sparkplug Sparkplug cap Oil sealing Key Stop switch Exhaust bend Carburettor gasket Flange Inlet gasket Carburettor Walbro Fan cover Carburettor gasket Flange Inlet gasket Ignition System Sirclip piston Cylinder complete Pistonring Piston complete 120 cc Cylinder gasket Small end bearing Crankshaft Mainbearing SKF 6203 Throttle cable support Start button Flywheel Clutch Clutch drum 12 t Clutch drum 11 Clutch drum for belt drive Needle bearing clutch drum Spacer for clutch Crank case gasket Crankcase Start engine complete Start sprocket Hub start sprocket Exhaust nut Decompression valve automatic Valve bushing Valve tube Bushing for cover Flywheel nut 24 5203 55124 55129 55135 55140 55147 55161 55165 55412 7813 Carburettor flange Screw allen key 5 x 12 Screw allen key 5 x 25 Screw 5x25 Screw allen key 5 x 45 Screw allen key 5 x 50 Screw allen key 5 x 45 Screw allen key 6 x 40 Washer M8 Battery RAKET 120 User Manual 3012 3056 ie 30559 Ber 32170 3007 Oras N Do l a ED Van BE oe gt 32163 3053 32171 32090 Den lt gt 55147 E 32086
3. 32086 Pistonring 32087 Piston complete 120 cc 32090 Cylinder gasket 32091 Small end bearing 32092 Crankshaft 32093 Mainbearing SKF 6203 3095 Key 3099 Oilsealing drive side 3119 Stop switch 3120 Stop cable 3131 Axle string disc 3132 Exhaust bend 3133 Starthandle 3134 Stringdisc 3135 Magnapull spring 31371 Start coat 3138 Start string 31391 Start coat complete 32116 Flywheel 32126 Cylinder cover 32143 Clutch 32144 Clutch drum 12 32144 1 Clutch drum 11 32144 2 Clutch drum for aero 32148 Spacer for clutch 32150 Crankcase 32163 Exhaust nut 32049 Throttle cable support 22 32147 32151 32152 4118 5203 55140 55142 55167 55109 55126 55129 55156 55392 55393 55405 55412 Needle bearing clutch drum Crank case gasket Decompression valve Flywheel nut Carburettor flange Screw allen key 5 x 45 Screw allen key 5 x 50 Screw allen key countersunk 6 x40 Screw allen key 4 x 20 Screw allen key 5 x 20 Screw allen key 5 x 25 Screw allen key 6 x 22 Countersunk washer Countersunk washer 6 x 25 Washer M4 Washer M8 RAKET 120 User Manual 3053 3420 ES 3131 KT Sy Ouo 55156 132147 39148 00 f u SY 32150 i o 3153 3152 55126 23 RAKET 120 User Manual Raket 120 Electric Start 3007 3010 3012 3012 1 3029 3053 3054 3055 3056 3099 3095 3119 3132 32063 32065 32066 32048 32059 32063 32065 32066 32076 32089 32085 32086 32087
4. is to enrich the fuel during start by restricting the air flow and increasing the vacuum in the venturi When you intend to start your Raket engine you normally close the choke and pull the starter rope After one or two pulls the engine will start As the fuel mixture with closed choke is very rich the engine will normally stop soon Then you open the choke open the throttle a little and pull the starter again Now the engine shall normally start on the first pull and run smoothly Installation Apart from connecting the carburettor to the fuel tank you also connect the lever of the throttle shaft to your accelerator pedal or other device that controls the speed of the engine Note that on the carburettor there is an idle speed adjustment screw that allows you to set the rpm when the engine idles The correct setting is found in combination with the setting of the low speed needle valve When idling you shall be able to open the throttle without any tendencies for the engine to stop or stall When you make this adjustment you normally let the engine run at a speed a little over the normal idle speed by turning the inlet speed adjustment screw a little clockwise Adjust the low speed needle valve so that the engine responds directly when the throttle is opened both slowly and quickly When you have found the best setting turn the low speed adjustment screw counter clockwise until the correct idle speed is found Service Actually there
5. isn t much that can go wrong If your fuel mixture is clean so no deposits clog up the interior of the carburettor you will have a problem free operation We recommend you to change the two diaphragms and the gaskets once every year If you haven t used your engine for some time the diaphragms may have hardened and you may change them if you notice the engine is more difficult to start or it doesn t run smoothly at low rpms If you are troubled with unstable operation i e sometimes the engine stops at idle speed sometimes it revs up and you have to adjust the setting of the low speed needle valve Then it may RAKET 120 User Manual be the inlet needle valve that is causing you problems and we recommend you to change the inlet needle valve part No 32025 NOTE If you find that you have problems with deposits in the interior of your carburettor due to contaminated fuel we recommend you to install a small fuel filter in the hose between the tank and the carburettor If none of the hints above solve your problems and you still have problems with low power or unstable idle speed check the condition of all gaskets in the carburettor and between the carburettor heat shield part No 32065 and the cylinder If this doesn t solve your problems we recommend you to disassemble the carburettor from the engine and have it cleaned by Radne Motor or one of our service agents You may also find professional help at a service station for p
6. of the ignition coil If you have disassembled the engine first mount the flywheel on the shaft Don t forget the crankshaft key Tighten the flywheel nut with 5 kg Then place a stainless non magnetic feeler gauge 0 35 mm thick between the yoke of the coil and the part of the flywheel where the pole shoes of the magnet are seen Tighten the screws that hold the coil to the crankcase The only maintenance for the flywheel itself is cleaning Also make sure that the starter claws near the centre can move freely Never attempt to make any modifications of the flywheel If the flywheel is damaged replace it with a new one See also under Safety precautions The emergency breaker On the coil there is an electric contact which must be connected to the emergency breaker When this contact is short circuited to ground i e to the metal parts of the engine the ignition is stopped Depending on application the emergency breaker can have many different designs It is your responsibility to make sure that the breaker is placed so that it can be easily reached from the place of normal operation On a kart it is convenient to place the stop button on the steering wheel Spark plug The spark plug is a special design for this type of engine When you replace the spark plug make sure that you get an original part or an identical replacement Other spark plugs can permanently and mechanically damage your Raket engine In original the Raket 120 e
7. rope slowly until you feel that the starter mechanism has engaged the engine Then you pull the rope with a powerful stroke never pull out the full length of the rope Test once slowly to extend the full length of the rope Notice this length and then never pull it out so far again Because the life length of the starter rope is very long subject that you don t pull it to the end Even if the end of the rope is protected by a sleeve it is the full extension of the rope that cuts off the knot at the end Service If the rope is broken always replace it with an original dyneemic rope with string lock part No 3075 or at least a rope of exactly the right length 1150 mm This is how you assemble the starter again first check the starter coil spring If it is dirty blow it or wipe it clean Don t put oil or grease on it unless you have special oil for coiled springs Coil in the spring in the cassette Put the protective washer in the bottom of the cavity for the spring then the spring in its cassette take a new dynamic rope and make a knot at one end You may find it suitable to burn the end of the rope with a cigarette lighter flame before you tie the knot but don t burn the rope as this will cause it to break more easily Put the protective sleeve on the free end of the rope and slide it all the way to the end with the knot Thread the rope through the hole in the rope disk don t forget the string lock you find it near
8. spare parts due to its simple and reliable design The table below shows some typical service intervals Please notice that the conditions under which the engine is operated will have great influence on these intervals Every 200 hours piston rings Every 300 hours spark plug centrifugal clutch drum and weights if the drum shows sign of wear on the inside of the drum Every 400 hours piston small end connecting rod needle bearing main roller bearings sealing rings gaskets How to mix gasoline and oil for proper fuel Every engine needs oil to lubricate cylinder and piston and all the different bearings and sealings In a four stroke engine the oil is normally kept in the crankcase and pumped around to where it is needed Raket 120 is a two stroke engine and two stroke engines don t have any separate oil for lubrication As oil still is needed the oil is mixed with the gasoline and thus follows the fuel in and around in the whole interior of the engine If you would attempt to run the Raket 120 engine on fuel with no oil in it the engine would break down due to the internal friction between cylinder and piston For this reason it is important that you always use a gasoline and oil mixture as fuel The Raket 120 is designed to run on a mixture of 4 per cent synthetic oil in lead free gasoline 95 or 98 octane NOTE If you have your engine equipped with catalytic emission control catalytic converter you MUST use
9. NOTE If your engine is equipped with catalytic emission control the temperature of the catalytic converter is extremely high also a long time after you have stopped the engine Make sure that any contact with the muffler and the catalytic converter is impossible 6 The exhaust fumes are poisonous and contain carbon mono oxide Never run your engine in a confined environment Make sure that neither you nor any other person is exposed to the fumes from the running engine RAKET 120 User Manual Make yourself familiar with the Raket 120 engine Other side OANDARWN 7 Main component Crankcase engine stand Carburettor Ignition Spark plug Decompression valve Magnapul start Clutch Cylinder and piston Crankshaft Mufflers Wearparts Preparations for start Problems Learn about Assembly of engine in chassi or frame How to set the jets Electrical settings 12 Nippondenso W22MP U How to start How to change rope How to maintain the clutch Maintenance hints 15 Service hints Different types and how to install them When to change them How to solve them Page RAKET 120 User Manual How to install the Raket 120 engine in a chassis or frame For the assembly of the Raket 120 engine four threaded holes M8 are provided in the bottom of the crankcase For mounting the engine in a kart a special mounting plate is available part No 3004 with mounting clamps part No 3005 which facilitates the ass
10. RAKET 120 Radne Motor AB English RAKET 20 User Manual Introduction Congratulations to your choice of engine The Raket 120 is a multi purpose engine which you will find useful for many applications If you read this manual before you install and start your new engine you can avoid some costly mistakes Keep this manual as a reference it is a part of the complete delivery from Radne Motor AB in Sweden or our distributors Read carefully the safety precautions on page 5 If you after having read this manual have more questions about the Raket 120 engine or the installation of it for any particular application you are always welcome to contact Radne Motor or our local distributor We want to make sure that every product we produce and sell will meet the expectations of our customers Information when contacting us Radne Motor AB Box 3035 S 136 03 Haninge Sweden phone 46 8 556 506 90 fax 46 8 556 506 91 e mail info radne se home page www radne se Rev 2 2002 11 30 Radne Motor AB 1998 2002 RAKET 120 User Manual Radne Motor AB Radne Motor AB was founded in 1967 by Leif Radne to manufacture and sell parts for gokart racing Approx thirty years later this is still the business idea of the company and it is still led by Leif Radne Radne Motor is today the leading Nordic gokart business Radne Motor represents the leading manufacturers of tyres chassis and personal protection and is also produci
11. aket engines The first Raket engine was introduced in 1972 Extensive research for a reliable simple to use yet fun to drive gokart engine at an acceptable price had convinced Radne Motor to start the manufacture of such an engine Power chain saw engines are the toughest two stroke engines that are built and Radne Motor decided to build the gokart engine on well tested vital parts Hence cylinder and piston crankshaft carburettor and ignition system were purchased Radne Motor manufactured other parts that are typical for a gokart engine like the aluminium crankcase Finally the engine was assembled and tested by Radne Motor before it was shipped All Raket engines have been built around this concept which has proven to be very successful Today the Raket line of engines consist of Raket 60 for the very young drivers This engine has rope start centrifugal clutch and forced air cooling It can be equipped with catalytic emission control and a rev limiter Raket 85 is the most popular and most produced Raket engine It is used in many countries for the youngest drivers Often the same engine is used with some type of power restrictor for the youngest and later with the restrictor removed for the more professional drivers The Raket 85 engine has a whole series of extras and conversion kits so it can be used also for indoor driving and for rental kart use Raket 120 is used mainly for Ultra Light Aircraft so called Para gl
12. e Power Exhaust Muffler consists of three parts the exhaust tube that is bolted to the cylinder the flexible hose that connects the exhaust tube with the muffler and the tuned muffler with or without emission control The three parts of the Power Muffler have been tuned to give the best highest output and we advise against the change of any of the three parts If you reduce the diameter of the tubes or the volume of the end muffler you will loose power If you shorten the length of the flexible hose the torque curve of the engine will show lower values at lower speeds Catalytic emission control At Radne Motor we take pride in the care of our environment For this reason we recommend the use of a catalytic exhaust converter and all our mufflers can be delivered with or without a converter NOTE a muffler with catalytic converter will be much hotter than one without So when your engine is equipped with catalytic converter take special care to protect the muffler from accidental contacts NOTE a muffler with converter cannot be repaired If damaged it has to be replaced NOTE don t throw away a muffler with catalytic converter Find out where in your community you can safely deposit your used catalytic mufflers NOTE always use lead free gasoline as gasoline with lead in will momentarily destroy your muffler 16 RAKET 120 User Manual Wearparts and service intervals The Raket 120 will need very few
13. effect e g that your karts start to move away from you How to stop the engine Put the emergency breaker in the ON stop position 18 RAKET 120 User Manual Engines with integrated electric start Technical data for electric start Part No Description 32156 Start engine FIAM 0 25 kW 32076 Ignition system SELETTRA 78013 Battery 12 V 7 5 AH 32170 Decompression valve automatic RAKET 120 Racing ES is always supplied with complete cables and battery To be assembled as per wiring diagram RAKET 120 Aero ES is always supplied without cables and bat tery depending on different applications Always use a cable with a min diameter of 4 mm2 Also always use a Start switch of high quality so that no sparks occur The stop switch shall be connected to the ignition system so that the engine stops when earthen The battery is not charged via the engine but has to be charged through a separate battery charger E g our automatic battery charger N B only for lead batteries art No 7817 The engine can be started approx 150 200 times with our battery of 7 5 AH without recharging the battery It is very important to choose right size of battery depending on how many times you need to start the engine Min 4 mm2 Ed Min 0 7 mm2 _ ooo 4 EK I EG I VANS No 19 RAKET 20 User Manual Troubleshooting Problem No fuel is drawn from the tan
14. embly as well as the adjustment of the chain tension Note the correct length of the M8 bolt is important The depth of the threaded hole is 20 mm You should make sure that when fully inserted in the hole the bolt uses at least 18 mm of the treaded hole but also that the bolt is not too long to penetrate into the crankcase For mounting the engine in a ULA the specifics for each ULA will determine the best mounting procedure The crankcase and the cover over the rope starter are made of aluminium You must protect all rotating parts for two reasons First is to prevent you or another person to come in contact with a chain or shaft where you can get caught and be injured Secondly because of the high speed of the engine up to 15 000 rpm very big forces are present If a chain or shaft should break you must be protected against parts that can be thrown away If you feel uncertain about the design of these protections you should consult someone for professional help After you have mounted the engine to the frame or structure you must make the following connections connect the fuel tank with the carburettor inlet nipple connect the accelerator pedal or equivalent with the throttle of the carburettor connect the emergency breaker These are all the connections needed RAKET 120 User Manual The carburettor The Raket 120 is equipped with a Walbro diaphragm carburettor of type VG6 with fixed High Speed jet How it
15. iders This engine is extremely powerful for its low weight But Raket 120 has found many more uses both for gokart and where the low weight in combination with high power and good reliability is appreciated Spare parts and service for the Raket engines are available from Radne Motor or from our distributors We recommend that you consult our catalogue A new catalogue is produced every year in which you find the latest parts and also hints for the best use of your Raket engine Raket 60 Raket 120 Raket 120 Racing ES RAKET 120 User Manual Safety precautions The Raket 120 engine is intrinsically a very safe design If you follow these rules and general rules for machine safety you should not encounter any risks or hazards 1 Always equip your engine installation with a safety switch which will make emergency stop possible from where the engine is normally operated 2 Always protect rotating parts with protective covers 3 Never machine any rotating parts It is explicitly forbidden to machine the flywheel or the clutch drum as machining can cause them to explode 4 Take care when you handle gasoline It can ignite if exposed to heat or flame Always stop the engine when you fill up with gasoline 5 Cylinder and muffler become very hot and you must protect yourself and other persons from accidental contact with hot parts Also after the engine has been stopped those parts remain hot for quite some time
16. k to the carburettor Carburettor is pumping fuel OK but engine doesn t start Spark plug is wet Carburettor is pumping fuel OK inlet valve is OK but engine won t start Engine starts but won t run at high speed Engine won t start no spark in the spark plug No spark even after change of spark plug Emergency breaker circuit OK but still no spark Carburettor seems OK but engine power is reduced and engine runs erratically If the start sprocket doesn t react If the engine starts and then stops immediately Check Check that there is fuel in the tank Check for leaks in the fuel hose or its connections Check if the inlet needle valve in the carburettor is stuck You can open it by pressing down the main diaphragm with a 3 mm wire through a hole in the cover over the main diaphragm Change the carburettor pump diaphragm and the gasket Check the inlet needle valve function Is the valve stuck in open position Is the inlet needle valve spring broken Replace inlet valve and spring when necessary Check setting of low speed jet Normal setting is 1 turn open from closed position Clean inside of carburettor Check if high speed jet is open Clean jet if necessary Change the spark plug Check emergency breaker circuit In OFF running position the contact on the ignition coil must not be connected to ground Change the complete ignition unit ignition coil Check piston rings Normal service life is 200 hou
17. l When you assemble the clutch put some heat resistant grease like graphite grease on the needle bearing Cylinder and piston The cylinder has a permanent coating in the bore that will last the life of the Raket engine The piston is made of aluminium and will under normal conditions have a life time of 500 hours The difference between long and short life for the piston is determined by the type of inlet air filter that is used The piston is equipped with two piston rings each 1 5 mm thick They have a life time of 200 hours under normal running conditions On the top of the pistons there is a marking showing which part of the piston that shall face the exhaust port New pistons are only available in one dimension as spare parts This has been made possible due to the extreme tolerances of the cylinders and the pistons When replacing piston or piston rings make it a good rule also to replace the small end needle bearing and the cylinder foot gasket Crankshaft The crankshaft with connecting rod and connecting rod needle bearing is one unit and we don t recommend any attempts to repair this unit The bearings on the crankshaft are SKF 6203 C 3 This bearing cannot be replaced by any standard bearing Larger radius of the inner ring When you disassemble the crankcase the bearings should normally sit on the shaft 15 RAKET 20 User Manual Mufflers Raket 120 can be delivered different muffler arrangements Th
18. l has passed the pump it reaches the inlet valve sometimes referred to as the inlet needle valve part No 32025 The normal position for the valve is closed The valve can be opened only if the main diaphragm part No 32017 is pressing down the lever part No 32024 It is the amount of fuel in the main chamber that makes the main diaphragm move When the valve is open the fuel will flow into the main fuel chamber of the carburettor From the main chamber the fuel can flow into the venturi of the carburettor through two jets One jet is fixed and controls the flow of fuel at high speed The size of this jet is factory set and shall not be changed If you change the fixed jet to another size you will either loose some power or your engine will run too lean and seize up The second jet is adjustable it is a needle valve It controls the flow of fuel at low speed The normal setting of this needle valve RAKET 120 User Manual is one turn open from its closed position Before you make any attempts to start the engine make sure that the needle valve is in the one turn open position Later you may open it a little further to make your engine run a little richer or close it to make the engine run leaner NOTE never set the low speed valve less than of a turn open as leaner settings may cause severe engine problems The carburettor is equipped with a cold start device sometimes referred to as the choke The purpose of the choke
19. lead free gasoline If you don t have a catalytic converter you could use leaded gasoline but we still recommend the unleaded types preferable with 98 octane but 95 will also do How to get 4 oil mixture Use a clean can or fuel container Mix 10 liters of fuel with 0 4 liters of synthetic oil Shake well Your gas station can offer you a variety of two stroke oils We recommend the type that is used for chain saws lawn movers and smaller motorcycles Two stroke oil for marine use is called outboard oil and is not recommended depending on the extra ingredients for corrosion control Don t use so called racing oil sometimes also called castor oil This type of oil mixes not so well with the gasoline and may later separate in the tank 17 RAKET 120 User Manual Environmental fuel In some countries fuel for lawn movers garden tools chain saws etc is made from other raw materials than oil The advantage of these fuel products is that they produce less of exhausts that polute the environment Before you use a fuel of this kind make sure with the manufacturer that you can do so without harm to your Raket engine Also get the recommendation from the manufacturer to the percentage of synthetic oil mixture that corresponds to 4 of oil in normal gasoline Radne Motor AB takes no responsibility for damages that may occur due to use of improper types of fuel and oil Preparations for start 1 Check the condition of the engine ins
20. ng the Raket line of engines mainly for gokart use In Sweden Radne Motor is well known for very good service Orders are normally shipped the same day as they arrive The repair and service of engines and karts is done in one of the most modern kart service shops in Europe Radne Motor is also present at most gokart racing tracks in Sweden either through distributors or from the Radne service and spare parts van Over the years more than 25 000 Raket gokart engines have been produced They form today the basis for many classes for young drivers Raket engines are used for racing for rental karting or just for karting for fun For whatever purpose its owner always appreciates the extreme durability of the Raket engine Radne Motor has distributors in 25 countries abroad so it is very likely that you will find one also in your country Ask for a list of distributors But you can also order products and parts directly from Radne Motor Customers abroad find it very convenient to order engines and parts via Internet our home page is www radne se Radne Motor publishes every year a new catalogue with all the parts we sell The catalogue also contains complete spare parts lists for most of the products we sell In many countries Radne Motor has issued homologation forms that describe in detail all critical measures for the Raket engines These forms are available from the national automobile sport federations RAKET 120 User Manual R
21. ngine is equipped with a Nippondenso 11 RAKET 120 User Manual W22MP U spark plug This has the correct length of the threaded part which exactly matches the threaded part of the cylinder The correct distance between the centre electrode and the side electrode is 0 4 mm This distance shall be measured with a piece of wire 0 35 mm in diameter During normal operation the spark plug shall have a brownish surface on the centre electrode However the colour can differ a lot If you stop the engine directly after heavy load the centre electrode can be light grey or light brown On the other hand if your engine has been idling for a while before you examine the spark plug the centre electrode may be dark brown or even black For all the different applications that the engine has been tested for the recommended spark plug Nippondenso W22MP U has proven to be the best and no hotter or cooler plug is recommended The normal service life of a spark plug is 200 300 hours However we recommend that you have extra spark plugs available as e g repeated attempts to start a flooded engine too rich fuel mixture can destroy a spark plug 12 RAKET 120 User Manual The magnapull rope starter When you intend to start the Raket 120 engine you close the choke of the carburettor and push the decompression valve Then you should remember two simple rules never just pull out the rope Grab the rope handle and pull out the
22. ower chain saws snowmobiles or garden tools Air filter It is strongly recommended that the Raket 120 engine is equipped with an air filter Radne Motor has a number of different designs which all protect the interior of the engine from being damaged by sand dust and other hard particles See main catalogue i e inlet silencer No 5201 the inlet noise is drastically reduced resulting in total engine noise reduction improved filter action prolongs engine life length protects the engine during rainy operations from being flooded with water can improve the engine torque curve at low speeds depending on inlet silencer and output muffler arrangement please contact Radne Motor for advice 10 2 RAKET 120 User Manual Ignition The Raket 120 engine is equipped with a solid state ignition system which consists of a minimum of parts The ignition coil with built in electronics The flywheel with the permanent magnet The emergency breaker stop button When the flywheel rotates past the ignition coil an electric current is generated At a certain position of the flywheel in relation to the ignition coil the electronic circuit which is integrated in the coil assembly causes the coil to produce a high tension spark for the spark plug As there are no moving parts there is no setting needed The only measure that can influence the ignition is the distance between flywheel and the yoke
23. rs but can be reduced if no proper air filter has been used Check crankshaft sealing rings If rings are leaking operation at both low and high speed is affected Too low power voltage in the battery or too small diameter of the cable Can depend on dirt in the decompression valve or in the reverse valve on the vacuum hose to the cylinder 32013 32014 32015 32016 32017 32018 32019 32020 32022 32023 32024 32025 32026 32027 32028 32029 32031 32032 32035 32036 32037 Plate Screw Chokeaxle Cap Main diaphgram Gasket Screw Expansion cap Screw Axle Lever Valve Spring Expansion cap Sirclip Fuel elbow High speed mixture screw Spring Low speed mixture screw Spring Screw 32038 32039 32040 32042 32043 32044 32045 32046 32047 32155 RAKET 120 User Manual Trottleshaft Bushing Spring Filter small Filter Screw Diaphgram Gasket Pump cover Gasketset for carburettor RAKET 120 User Manual Raket 120 Manual Start 3007 Spring 40 mm 3010 Flex 3012 Silencer 3012 1 Silencer Catalytic converter 32048 Carburettor Walbro 3053 Exhaust gasket 3054 Screw 5x25 3055 Sparkplug 3056 Sparkplug cap 32063 Carburettor gasket 32065 Flange 32066 Inlet gasket 3075 String lock 3076 Ignition System 3077 Ignition cable 3099 Oil sealing sprocket side 3136 Washer fiber 3152 Start hook 3153 Spring start hook 3154 Spacer start hook 3158 Rubber bushing 32085 Cylinder complete
24. tallation Does the throttle operate well Is the emergency breaker correctly connected Is the flexible hose from the tank to the carburettor fastened so it will not break Is there enough gasoline in the tank Close the choke and push the decompression valve Grab the starter handle Pull out the starter rope until you feel that the starter has engaged the engine and then pull out the rope avoiding to pull it to the fully extended length 5 Observe the transparent fuel hose and note if gasoline is drawn from the tank to the carburettor 6 Repeat until you are sure that gasoline has entered the carburettor 7 Check that the emergency breaker is in the OFF running position 8 Pull the starter again until you hear that the engine starts ignites It is quite normal that the engine just rotates a few turns and then stops again due to the very rich mixture with the choke closed Open the choke 10 Pull the starter again Now the engine shall normally start and run at idle speed 11 Ifthe engine starts but stops again you may open the throttle just a little to increase the speed of the engine just after start After a few seconds at increased idle speed the engine shall run at normal idle speed NOTE if you equip your engine with an arrangement that allows you to lock the throttle in increased idle speed position this may result in that the clutch engages when the engine starts Make sure that this has no harmful
25. the centre see figure Then thread the rope from the inside and out through the fan cover and finally through the starter handle Before you make a nice knot at the free end of the rope remember to thread the washer that takes up the pulling force on the rope finally engage the slotted part of the rope disk with the inner end of the coiled spring While doing this make sure that the rope comes out through the opening slot at the periphery of the rope disk Assemble the parts No 55393 and 3131 and secure the disk with screw No 55156 Finally grab the end of the rope that comes out through the slot at the periphery of the disk and turn the rope disk clockwise three 13 RAKET 120 User Manual turns Hold the rope disk with the slot adjacent to the entrance of the starter rope in the fan cover Pull the rope by the starter handle and release the handle The spring will now pull the rope into the fan cover Repeat this action until all the rope is coiled into the fan cover when the starter handle is released The centrifugal clutch When the engine is idling the centrifugal clutch shall disengage the engine from whatever the engine is powering E g when used to power a gokart you release the accelerator pedal and the kart comes to a halt the engine shall continue to run on idle speed When you increase the rpm of the engine the clutch shall smoothly start to pull the gokart away If you look at the X ray drawing of the engine yo
26. u will see the parts of the clutch It consists of the hub with three spokes three powder iron weights and three short springs These parts are fastened to the shaft of the engine through a coarse counter clockwise left turn thread You will also find the clutch drum with the sprocket wheel for the chain The drum can rotate on the crankshaft due to a needle bearing in the centre hole of the drum NOTE a protective washer holds the needle bearing in place see drawing for details NOTE the clutch drum is made of very tough steel which is partly heat treated No machining what so ever on the clutch drum can be done as this may cause the drum to explode NOTE never attempt to start the engine with the clutch weights in place but without having assembled the clutch drum in place as this will cause the springs to break and drum weights to be thrown off The force of a drum weight can harm you lethally Service To disassemble the clutch first disassemble the fan cover Then use the special tool that is provided for the disassembly of the clutch hub Hold the flywheel with one hand and loosen the clutch from the shaft by turning it clockwise Note the thread on the shaft is counter clockwise left turn NOTE if any parts in the clutch are damaged they must be replaced with new original parts for safety reasons Never attempt to repair any detail of the clutch by welding brazing or machining 14 RAKET 120 User Manua
27. works The carburettor is connected to the fuel tank with a flexible hose made of rubber or plastic The hose connects to the fuel inlet nipple part No 32029 see figure When you pull the starter rope and the piston moves up and down the cylinder the pressure variations in the crankcase makes the pump diaphragm part No 32045 move up and down As the outer side of the diaphragm is connected to the fuel inlet nipple via two rubber valves the movement of the diaphragm will cause a pumping action that will draw fuel from the tank to the carburettor NOTE The tank and the engine shall be placed so that the carburettor normally shall suck fuel from the tank i e the fuel shall not flow freely from the tank to the carburettor causing an over pressure Neither shall the tank be placed so low that the pump of the carburettor has difficulties in pumping the fuel from the tank NOTE During normal operation the carburettor shall pump air free fuel from the tank If due to heavy vibrations or excessive movements of the fuel tank you can observe that the fuel is mixed with bubbles of air use a transparent plastic hose this may cause the engine to loose power or to stop If this problem cannot be solved by changing the mounting of the fuel tank you may try to equip the fuel take off in the tank with a fuel pick up Fuel pick ups are normally used in power chain saws and may be obtained from most chain saw service stations After the fue
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