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POLINI MINICROSS AND MlNlMOTARD OWNER'S AND MAINTENANCE MANUAL

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Filed Under (Polini) by admin on 22-11-2010

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Fit the stand using the M8x18 screw to fasten it and the spring provided (photo 1 6). A DANGER! We suggest you to remove the stand during competitions as it could be dangerous and bruising. 18- Fit the gear lever l~hoto 171. 19- Fill the fuel tank (See section 4.13). 20- Check the engine oil level (See section 4.3). INTRODUCTION Always ensure that the motorcycle has been efficiently serviced and check it over before riding it. Take your motorcycle to an authorised POIJNI MOTOR1 dealer for all maior servicing and repair. Because of the manufacturer’s policy OF continuous development, and because of constant innovations in technology, your motorcycle may differ in some details from that described in the illustrations and text in this manual. Original POLlNl MOTOR1 spare parts are always made from the same materials and in the same way as the parts originally fitted to your minicross motorcycle. Always insist on original POIJNI MOTOR1 spore parts. Their use ensures a longer life and improved efficiency for your motorcycle. 2. STARTING THE ENGINE FOR THE FIRST TIME Always check over your motorcycle thoroughly before starting the engine. To start the engine for the first time, as instructed below. 1 – Turn the fuel tap located under the fuel tank to #ON” position (photo 18) Run your new motorcycle in as instructed How to ensure that the engine and transmission bed in correctly and to ensure continuous reliability in Future. A CAUTION! The first time yw ride your new motorcycle, ride for about two hours at low engine speeds to ensure that it runs in correctly. Also respect the following precautions. 2- Once the engine starts, leave it idle until it warms up to normal temperature. If you switch the engine off for a short time, wait for it to cool down completely before you re-start it. – 3- During the running in period, always ride at constant 2- Before starting the engine put the gear in neutral position speeds. AVOID RAPID ACCELERATION. (photo 19, gear N). 4- Even when riding at low engine speeds, avoid extended A WARNING! IF the gear position is not neutral the bike could move when started. 3- If the engine is cold, lift the choke lever on the carburettor (photo 20). A WARNING! Lower the starter lever again as won as the engine starts to warm up. 4- Leove the throttle closed. Pivot the kick-start lever out wards and push energetically downwards with your foot to start the engine. 5- Return the kick-start lever to its rest position. Leave the engine idle for a few minutes to warm it up. A WARNING! Check that the engine stop button stops the engine effectively before yw begin riding the motorcycle. difficult sections of road or Lck that could cause the engine to become very hot. 5- Once you have run in your motorcycle following all these instructions, take it to a Polini Motori dealer for its post- running-in service. Apart from a change of spark plug and engine oil, this service also includes the disassembly

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2004 Honda CRF450R OWNER'S MANUAL

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Filed Under (Honda) by admin on 21-11-2010

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motorcycle can be kickstarted with the transmission in gear by disengaging the clutch before operating the kickstarter. Check the engine oil, transmission oil and coolant levels before starting the engine (page 21, 23, 24). Cold Engine Starting: 1. Turn the fuel valve ON. 2. Shift the transmission into neutral. 3. If the temperature is 35°C (95°F) or below, pull the choke knob fully out. 4. If the temperature is below 0°C (32°F), open the throttle two or three times. (The engine requires a richer mixture for starting in cold weather. When the throttle is so opened, the accelerator pump will feed extra fuel to the cylinder, thereby facilitating starting in cold weather.) 5. With the throttle closed, operate the kickstarter starting from the top of the kickstarter stroke, kick through to the bottom with a rapid, continuous motion. (Do not open the throttle, As the carburetor is equipped with an accelerator pump, excessive fuel will be charged into the engine, and the spark plug will be fouled if the throttle is opened and closed repeatedly. Excessive fuel in the engine makes kick- starting difficult.) 6. About a minute after the engine starts, push the choke knob back all the way to fully OFF. If idling is unstable, open the throttle slightly. (1) FUEL FILL CAP (2) BREATHER TUBE WARNING (1) FUEL VALVE (2) CHOKE KNOB Warm Engine Starting: 1. Turn the fuel valve ON. 2. Shift the transmission into neutral. 3. Pull the hot start lever and kick-start the engine. (Do not open the throttle.) 4. As soon as the engine starts, release the hot start lever 1. Shift the transmission into neutral. 2. Pull the hot start lever and kick-start the engine. (Do not open the throttle.) 3. As soon as the engine starts, release the hot start lever. Starting the engine excessively charged with fuel by throttle blipping or other reasons: 1. Shift the transmission into neutral. 2. With the throttle fully opened, repeat kickstarter operation approximately 10 times very slowly to discharge excessive fuel from the engine. 3. Pull the hot start lever and kick-start the engine (Do not open the throttle.) 4. As soon as the engine starts, release the hot start lever. Stopping The Engine 1. Shift the transmission into neutral. 2. Turn the fuel valve OFF. 3. Lightly open the throttle 2 – 3 times, and then close it. 4. Depress and hold the engine stop button until the engine stops completely. NOTE: • Failure to close the fuel valve may cause the carburetor to overflow. (1) THROTTLE GRIP (2) ENGINE STOP BUTTON Break-In Procedure Help assure your CRF’s future reliability and performance by paying extra attention to how you ride during the first operating day or 15 miles (25 km). During this period, avoid full-throttle starts and rapid acceleration. This same procedure should be followed each time when: • Piston is replaced • Rings are replaced • Cylinder is replaced • Crankshaft or crank bearing are replaced

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Yamaha Road Star Engine Guard Installation Manual

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Filed Under (Yamaha) by admin on 07-11-2010

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1. Protect the rear portion of the front fender with a towel or other thick, soft cloth. 2. Remove the OEM engine guards if they have been installed on the motorcycle. Or, if OEM engine guards are not present, Remove the two lower engine mount bolts. These bolts are located on the inside of the right and left frame rails, and will be replaced with the longer 10mm bolts included with your new engine guard. 3. Position the engine guard so that the lower brackets point towards the rear of the motorcycle, and slide the engine guard into the space between the front wheel and the frame. 4. Raise the guard until the upper V” mount is located between the frame rails. Note: Your new Barons engine guard is equipped with a unique upper V” mount clamp. This clamp becomes a cradle for the upper frame supports when it is inserted between the frame rails. 5. Rotate the engine guard until the lower mounting brackets are aligned with the lower engine mount holes. Due to production line tolerances in both the motorcycle and the engine guard, the mounting brackets may be too wide or too narrow for the frame. If this is the case, remove the guard from the motorcycle. Place the guard on a flat, firm surface. Insert a towel or other protective material between the guard and the surface. Using a rubber mallet or a block of wood and a hammer, tap the lower brackets until they are correctly spaced. 6. Insert the new 10mm bolts and washers, and finger tighten only. 7. Tighten each 3/8″ bolt in the upper clamp evenly by using a 9/16″ socket or a wrench. Snug down each bolt until it draws the front of the upper clamp into contact with the upper frame supports, then adjust these bolts accordingly to achieve equal spacing between each floorboard and the lower engine guard rail. 8. Tighten the jam nuts against the washers to lock each bolt in place. CAUTION! It is critical that you do not over-tighten these bolts. Tighten all remaining nuts and bolts securely. If necessary, slightly loosen rear brake line banjo bolt and rotate banjo fitting for clearance with engine guard. Tighten banjo bolt and check brake for proper operation. You must re-tighten all four of the engine guard mounting bolts after 100 miles of riding! Care & Cleaning: Engine guards take the full brunt of the worst of what the weather in your area has to offer, making it critical that proper and complete cleaning take place on a weekly basis, or corrosion will occur which is not covered by warranty! Proper cleaning procedure would be to use a product like Simple Green, LOC, Salt-Away or similar. Mix a strong batch and apply it liberally with a soft towel or soft nylon brush to the entire

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Triumph T595 Daytona and T509 Speed Triple Specifications

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Filed Under (Triumph) by admin on 06-11-2010

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1. Tachometer 8. Turn Indicator light 2. Tachometer ‘Red Zone’ 9. Low Oil Pressure Warning Light 3. Speedometer 10. High Beam Indicator Light 4. Odometer 11. Neutral Indicator Light 5. Trip Meter 12. Low Fuel Level Indicator Light 6. Trip Meter Reset Knob 13. Engine Management Malfunction 7. Coolant Temperature Gauge Indicator Light SPEEDOMETER The speedometer indicates the road speed of the motorcycle. In the speedometer face are the odometer and trip meter. The odometer shows the total distance that the motorcycle has travelled. The trip meter shows the distance travelled since the meter was last reset to zero. The trip meter can be reset to zero by rotating the reset knob situated on the left hand side of the speedometer. TACHOMETER The tachometer shows the engine speed in revolutions per minute – rpm (r/min). On the right side of the tachometer face is the ‘red zone’. Engine rpm (r/min) in the red zone is above maximum recommended engine speed and is also above the range for best performance. / f&it. ::;:%M,to %:th:’z zone as severe engme damage may NOTE The ‘Red Zone’ position for Daytona is different to that on the Speed Triple. Page 16
General Information COOLANT TEMPERATURE GAUGE The coolant temperature gauge indicates the temperature of the engine coolant. On the right -hand side of the gauge face is the ‘red zone. If the temperature gauge needle moves into the ‘red zone’ this indicates that the engine is overheating. needle enters the ‘red zone’ as severe WARNING LIGHTS I a0 INDICATORS When the indicator switch is turned to left or right, the corresponding direction indicator light flashes on and off. cl ~ LOW OIL PRESSURE: The low oil pressure warning light becomes illuminated whenever the oil pressure is dangerously low (or the ignition switch is in the ‘ON’ position with the engine not running). When the engine is running, the light will remain off when sufficient oil pressure is present. When starting the motorcycle, check that the light comes on when the ignition is in the ‘ON’ position, but goes out as soon as the engine starts A! CAUTION: Stop the engine immediately if the low oil pressure warning light comes on during normal operation. Do not restart the engine until the fault has been rectified. Severe engine damage will result from running the engine when the oil warning light is illuminated. HIGH BEAM: When the headlights are switched on and the headlight dip switch is set to ‘high beam’, the high beam warning light will illuminate. IElI NEUTRAL: The neutral warning light indicates when the transmission is in neutral (no gear selected). The warning light will illuminate when the transmission is in neutral with ignition switch in the ‘ON’ position. ml LOW FUEL: The low fuel indicator will illuminate when there are approximately 3.7 litres of fuel remaining in the tank. Et3 ENGINE MANAGEMENT SYSTEM MALFUNCTION INDICATOR LIGHT: The malfunction indicator light for the engine management system illuminates when the ignition is switched on, remains illuminated during starting, and goes out shortly after the engine starts. If the malfunction indicator light becomes illuminated during riding, a fault has occurred in the engine management system. In this case the system will switch to ‘limp-home’ mode so that riding may continue. Contact an authorised Triumph dealer as soon as possible to have the fault checked out and rectified

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HARLEY DAVIDSON ENGINE/ TRANSMISSION INTERFACE AND TOP COVER INSTALLATION INSRUCTIONS

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Filed Under (Harley Davidson) by admin on 31-01-2011

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INSTALLATION Perform this installation when the engine is cool. Working on or near the exhaust system when the engine is hot could result in severe burns. (00311a) 1. Refer to the Owner’s Manual and follow the instructions given to remove the maxi-fuse. 3 1 2 is02998 1. Transmission top cover screw (4) 2. Oil spout assembly screw 3. Upper bearing housing screw (2) Figure 1. Interface Cover Installation 2. See Figure 1. Remove and retain the four socket head cap screws (1) that fasten the front and right side of the transmission cover. See Figure 3. Obtain the chrome top interface cover (3) from the kit. NOTE The top interface cover can be carefully brought into position on top of the transmission housing from either the right or left side without removing or loosening any vehicle components. 3. Position the top interface cover over the transmission top cover. Loosely fasten the chrome cover to the top of the transmission housing with the screws removed in Step 2. 4. Obtain the chrome filler neck cover (4), 1/4-20 socket head screw (5), flat washer (6) and spacer (7) from the kit. Remove the oil level dipstick from the oil spout on the side of the transmission housing, wipe off and set it aside for later installation. NOTE Insert a clean shop rag into the oil spout opening while the dipstick is not installed. With the dipstick removed, small parts or other foreign material could fall into the transmission, leading to equipment damage or malfunction. 5. See Figure 1. Remove and discard the socket head cap screw (2) that fastens the oil spout assembly to the transmission housing. DO NOT remove the oil spout from the vehicle. 6. Place the flat washer over the threads of the new screw, and insert the screw into the unthreaded hole in the chrome filler neck cover. Place the spacer onto the screw threads. Apply a few drops of Loctite® 243 (Blue) to the screw threads, and position the chrome cover onto the oil spout on the transmission housing. Lubricate the filler neck gasket with soapy water to aid in installation. Tighten the screw to 84-132 in-lbs (9.5-15 Nm) . 7. See Figure 3. Obtain the chrome lower side interface cover (1), one #10-24 socket head screw (8) and one chrome flat washer (9) from the kit

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HONDA CT110 SERIES MOTORCYCLE Cold engine Starting Procedure

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Filed Under (Honda) by admin on 15-11-2011

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Prime the engine before starting by cranking the engine several times with the kick starter. The ignition switch should be OFF, the choke lever Fully ON (A) and the throttle opened slightly. Flooded Engine If the engine fails to start after several repeated attempts, it may have become flooded with excess fuel. To clear the engine, turn off the engine stop switch and lower the choke lever to Fully OFF (B). Open the throttle fully and crank the engine several times with the kick starter. Turn the engine stop switch to RUN and open the throttle slightly; start the engine using the kick starter When service is required, remember that your authorized Honda dealer knows your motorcycle best and is fully equipped to maintain and repair it. The scheduled maintenance may also be performed by a qualified service facility that normally does this kind of work; or you may perform most of the work yourself it you are mechanically qualified and have the proper tools
and service data. • These instructions are based on the assumption that the motorcycle will be used exclusively for
its designed purpose. Sustained high speed operation, or operation in unusually wet or dusty conditions, will require more frequent service than specified in the MAINTENANCE SCHEDULE. Consult your authorized Honda dealer for ecommendations applicable to you individual needs
and use

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HARLEY DAVIDSON ENGINE/TRANSMISSION INTERFACE AND TOP COVER INSTALLATION MANUAL

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Filed Under (Harley Davidson) by admin on 19-04-2011

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INSTALLATION Perform this installation when the engine is cool. Working on or near the exhaust system when the engine is hot could result in severe burns. (00311a) 1. Refer to the Owner’s Manual and follow the instructions given to remove the maxi-fuse. 1 4 3 2 is03621 1. Transmission top cover screw (3) 2. Upper and lower rear bearing housing screw (2) 3. Upper front bearing housing screw 4. Lower front bearing housing screw Figure 1. Interface Cover Installation 2. See Figure 1. Remove the two rear bearing housing screws (2) from the side of the transmission case. 3. Remove the oil level dipstick from the oil spout on the side of the transmission housing, wipe off and set it aside for later installation. NOTE Insert a clean shop rag into the oil spout opening while the dipstick is not installed. With the dipstick removed, small parts or other foreign material could fall into the transmission, leading to equipment damage or malfunction. 4. See Figure 2. Obtain the rear interface mounting bracket (1) from the kit. 5. Apply a few drops of Loctite 243 (Blue) to the threads of the two bearing housing screws removed in Step 2. Install the rear interface mounting bracket to the bearing housing with the screws, and tighten to 13-18 ft-lbs (17.6-24.4 Nm) . 6. See Figure 1. Remove the upper front bearing housing screw (3) from the side of the transmission case. Loosen the lower front bearing housing screw (4). 7. See Figure 2. Obtain the front interface mounting bracket (2) from the kit. 8. Apply a few drops of Loctite 243 (Blue) to the threads of the upper front bearing housing screw removed in Step 6. Hook the slot in the front interface mounting bracket under the loosened lower screw head. Install the bracket to the bearing housing with the upper screw, and tighten both screws to 13-18 ft-lbs (17.6-24.4 Nm) . 9. See Figure 1. Remove and retain the three socket head cap screws (1) that fasten the right side and left front corner of the transmission cover. 10. Remove and retain the screw fastening the rear brake line P-clamp to the rear fork bracket. 11. See Figure 2. Obtain the right rear interface cover (3), two chrome 1/4-20 screws (6) and two flat washers (7) from the kit. 12. From the rear of the motorcycle, bring the right rear interface cover into position behind the rear exhaust pipe, over the bearing housing. The hole in the top surface of the cover should be positioned over the right rear transmission top cover hole. 13. Loosely fasten the interface cover to the rear interface mounting bracket with the two chrome screws and flat washers. 14. Obtain the chrome top interface cover (4) from the kit. 15. Position the top interface cover over the transmission top cover, overlapping the tab at the top front of the chrome right rear interface cover

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Harley-Davidson Motorcycle Reverse Gear Installation Instructions

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Filed Under (Harley Davidson) by admin on 31-10-2010

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2.1 Obtain a small tube of Loctite® #262 (red) for use later. 2.2 Drain the transmission oil. 2.3 Remove the clutch adjustment cover (left side). 2.4 Remove rear exhaust header pipe (cross over exhaust pipe). 2.5 Remove the muffler support bracket. 2.6 Remove the clutch release cover (right side). 2.7 Remove clutch push rod and oil slinger. To be disassembled and modified later. 2.8 Remove the two nuts from the main (rear) and counter (front) transmission shafts. 2.9 Remove the transmission bearing housing (puller available from Champion Sidecars). To be replaced with new reverse gear transmission bearing housing (Trap Door). 2.10 Cover the exposed gears in the transmission with a cloth in preparation to cut the shifter fork shaft. 3 Install New Main and Countershaft Gears NOTE: Gears and Tapered Split Rings are factory matched sets. Do not mix!. 3.1 Locate the shifter fork rod, mark fork rod flush at transmission case and pull out 1/4″. Figure 1 Figure 2. Exposed Shoulders Mark shifter fork rod flush with case Remove Spacers Vehicle Transmission Counter Shaft Main Shaft Front of Motorcycle Figure 1
Reverse Gear Installation Instructions For EVO / 5 Speed and Twin Cam Harley-Davidson® Motorcycle Page 3 of 6 Revision 7 © 2007 Champion Motorcycle Accessories International, Inc. dba Champion Sidecars 11841 Monarch Street Garden Grove, CA 92841 (800) 875-0949 (714) 847-0949 www.championsidecars.com www.championtrikes.com Figure 6 CAUTION: Do not pull the shifter fork rod out of the transmission more than 1/4″. If you pull the shifter fork rod out too far, it will be difficult to realign it with the internal shifter fork. 3.2 Cut the shaft at the mark and push it back in. The shaft end MUST NOT stick out of the transmission case. If the shaft is in deeper, fill the hole with silicone to prevent the shaft from moving in and out. NOTE: Shifter fork is made of non-tempered metal and may be cut with a hacksaw or Dremel® cutting tool. 3.3 Important: Remove stock spacers from main and counter shafts. Spray with silicon remover (Brake-Clean) then, using supplied cleaning pad, clean shafts, new counter and main shaft gears and tapered lock rings (inside and outside) Figure 1 3.4 With motorcycle in neutral, pull both the shafts out and simultaneously push the OEM outermost gears in until seated completely to expose the shoulders of both shafts. The countershaft shoulder should be flush with the gear face. For the main shaft the gear would “hang over” the shoulder a small bit. Figure 2 3.5 Apply supplied Champion Super-Lock retaining compound to the inside and outside surfaces of the large gear tapered split ring, to the inside of the new countershaft gear (large gear) and to the transmission countershaft (the forward most shaft). 3.6 Install new countershaft gear to the transmission countershaft. Insert tapered split ring (tapered end first) into the countershaft gear. Install ring seat tool and spring to counter shaft and new countershaft gear. Torque ring seat tool to 40 ft-lb’s. Figures 3 and 4

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HONDA CRF250X OWNER'S MANUAL

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Filed Under (Honda) by admin on 01-12-2010

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Always follow the proper starting procedure described below. Your motorcycle can be kickstarted wirh the transmission in gear by pulling in the clutch lever before operating the kickstarter. Preparation Make sure that the transmission is in neutral. Turn the fuel valve ON. Fuel Valve Starting Procedure Always follow the proper starting procedure described as follow. 4. Warm up the engine; don’t operate the throttle. 5. About 15 seconds after the engine startes, push the choke knob back all the way to fully OFF. If idling is unstable, open the throttle slightly. Extended use of the choke may impair piston and cylinder wall lubrication and damage the engine. High Air Temperature 35°C (95°F) or above 1. Do not use the choke. 2. Keep the throttle fully closed. 3. Start the engine following step 3 under Normal Air Temperature. Low Air Temperature 10°C (50°) or below 1. Follow steps 1-4 under Normal Air Temperature. 2. Continue warming up the engine until it runs smoothly and responds to the throttle when the choke knob is pushed back all the way to fully OFF. Extended use of the choke may impair piston and cylinder wall lubrication and damage the engine. Hot Engine Starting 1. Pull the hot start lever (3) and start the engine following step 3 under Normal Air Temperature. 2. As soon as the engine starts, release the hot start lever. NOTICE NOTICE Basic Operating Instructions 15 (1) fuel valve The three-way fuel valve is used to control the flow of fuel from the fuel tank to the carburetor. ON -Turning the fuel valve ON before attempting to start the engine allows fuel to flow from the fuel tank to the carburetor. OFF -Turning the fuel valve OFF after stopping the engine prevents the flow of fuel from the fuel tank to the carburetor. RES -Turning the fuel valve to RES allows fuel to flow from the reserve fuel supply to the carburetor. (1) fuel valve (2) choke knob Check the engine oil, transmission oil and coolant levels before starting the engine (pages 44,47,48). To restart a warm engine, follow the procedure for ”High Air Temperature. ” Normal Air Temperature 10°C-35°C (50°F-95°F) 1. Pull the choke knob (2) up all the way to fully ON, if the engine is cold. 2. Keep the throttle fully closed. 3. Pull the clutch lever all the way in, and press the starter button with the throttle completely closed. Or operate the kickstarter to start the engine. Starting from the top of the stroke, kick through to the bottom with a rapid, continuous motion. Do not operate the throttle. Allowing the kickstarter to snap back freely against the pedal stop can damage the engine case.

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KTM 60 SX / 65 SX REPAIR MANUAL ENGINE

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Filed Under (KTM) by admin on 12-11-2010

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Carburetor adjustment Basic information about the original carburetor setting The original carburetor setting was adapted for an altitude of approx. 500 meters (1600 ft.) above sea level, and the ambient temperature of approx. 20°C (68°F), mainly for off-road use and central European premium-grade fuel (ROZ 95). Mixing ratio 2-stroke motor oil : super fuel 1:40 . Basic information of changing the carburetor setting Always start out from the original carburetor setting. Essential requirements are a clean air filter system, air-tight exhaust system and an intact carburetor. Experience has shown that adjusting the main jet, the idling jet and the jet needle is sufficient and that changes of other parts of the carburetor will not greatly affect engine performance. RULE OF THUMB: high altitude or high temperatures  choose leaner carburetor adjustment low altitude or low temperatures  choose richer carburetor adjustment * WARNING * -ONLYUSE PREMIUM – GRADE GASOLINE ROZ 95 MIXED WITH HIGH – GRADE TWO – STROKE ENGINE OIL . OTHER TYPES OF GASOLINE CAN CAUSE ENGINE FAILURE , AND USE OF SAME WILL VOID YOUR WARRANTY . -ONLYUSE HIGH – GRADE 2- STROKE ENGINE OIL OF KNOWN BRANDS ( I . E .SHELL ADVANCE RACING X). -NOTENOUGH OIL OR LOW – GRADE OILCAN CAUSE EROSION OF THE PISTON . USING TOO MUCH OIL , THE ENGINE CAN START SMOKING AND FOUL THE SPARKPLUG . -INTHE CASE OFA LEANER ADJUSTMENT OF THE CARBURETOR PROCEED CAUTIOUSLY . ALWAYSREDUCETHEJETSIZEINSTEPSOFONENUMBERTOAVOID OVERHEATING AND PISTON SEIZURE . NOTE: If despite a changed adjustment the engine does not run properly, look for mechanical faults and check the ignition system. Basic information on carburetor wear As a result of engine vibrations, throttle valve, jet needle, and needle jet are subjected to increased wear. This wear may cause carburetor malfunction (e.g., overly rich mixture). Therefore, these parts should be replaced after 1000 hours of using. Idling range – A Operation with closed throttle valve. This range is influenced by the idle adjusting screw 1 . Only make adjustments when the engine is hot. The idling speed can be changed by turning the idle adjusting screw. Turning it clockwise produces a higher idling speed and turning the screw counterclockwise produces a lower idling speed. Opening up – B Engine behavior when the throttle opens. The idle jet and the shape of the throttle valve influences this range. If, despite good idling-speed and part-throttle setting, the engine sputters and smokes when the throttle is fully opened and develops its full power not smoothly but suddenly at high engine speeds, the mixture to the carburetor will be too rich, the fuel level too high or the float needle is leaking. Part-throttle range – C Operation with partly open throttle valve. This range is only influenced by the jet needle (shape and position). The optimum part-throttle setting is controlled by the idling setting in the lower range and by the main jet in the upper range. If the engine runs on a four-stroke cycle or with reduced power when it is accelerated with the throttle partly open, the jet needle must be lowered by one notch. If then the engine pings, especially when accelerating under full power at maximum engine revs, the jet needle should be raised. If these faults should occur at the lower end of the part throttle range at a four-stroke running, make the idling range leaner; if the engine pings, adjust the idling range richer

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