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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KTM 250/ 300/ 380 SX,MXC,EXC ENGINE REPAIR MANUAL

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

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Repair manual KTM 250 / 300 / 380 Art No 3206004 -E 2-2C main jet jet needle jet needle air control screw idle adjusting screw idle jet throttle valve Idling range A Operation with closed throttle valve. This range is influenced by the position of the air control screw 1 and the idle adjusting screw 2 . Only make adjustments when the engine is hot. To this end, slightly increase the idling speed of the engine by means of the idle adjusting screw. Turning it clockwise produces a higher idling speed and turning the screw counterclockwise produces a lower idling speed. Create a round and stable engine speed using the air control screw (basic position of the air control screw = open by 1.5 turns). Then adjust to the normal idling speed by means of the idle adjusting screw. 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. Full throttle range D Operation with the throttle fully open (flat out). This range is influenced by the main jet and the jet needle. If the porcelain of the new spark plug is found to have a very bright or white coating or if the engine rings, after a short distance of riding flat out, a larger main jet is required. If the porcelain is dark brown or black with soot the main jet must be replaced by a smaller one. mixture too rich: too much fuel in proportion to air mixture too lean: not enough fuel in proportion to air 1 2 OPERATING RANGES OF THE CARBURETOR 2-3C Carburetor adjustment Basic information on 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 MOZ). Mixing ratio 2-stroke motor oil : super fuel 1:40 – 1:60. Basic information on a change of 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:

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2008 KTM 250 SX-F 250 XC-F, XCF-W 250 EXC-F, EXC-F SIX DAYS INSTALLATION MANUAL

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Filed Under (KTM) by admin on 22-10-2010

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Hand brake lever The hand brake lever [1] is mounted on the handlebars on the right and actuates the front wheel brake. The adjusting screw [A] can be used to change the basic position of the hand brake lever (see “Maintenance”). 1 A Short circuit button The short circuit button [2] turns off the engine. When pressing this button, the ignition circuit is short-circuited. 2 Headlamp switch (XCF-W) In this model the headlamp is switched on with the pull switch [5] . 5 Flasher switch The flasher switch is a separate unit and is mounted on the left portion of the handlebar. The wire harness is designed in a way that whenever you want to use your bike off-road, you can dismount the entire turn indicator system without affecting the function of the remaining electrical system. Flasher left Flasher right
OPERATION INSTRUMENTS » ENGLISH 7 1 2 3 4 5 Starter button Pushing the red starter button [1] will actuate the E-starter. Emergency OFF switch (EXC-F Australia) The red emergency-OFF switch [2] is arranged adjacent to the throttle grip. In this position, the E-starter is operational and the engine can be started. In this position, the E-starter and ignition circuits are interrupted.The E-starter cannot be actuated, and the engine will not start, not even if you attempt to start it with the kickstarter. Pushing the black starter button [3] will actuate the E-starter. Indicator lamps The green control lamp [4] flashes in the same rhythm as the flashing indicator when the indicator is working. The blue control lamp [5] lights up when the high beam is on. TEST All of the display segments briefly light up for the display function test. Electronic speedometer The display in the electronic speedometer is activated as soon as you press a button on the speedometer or an impulse is received from the wheel sensor. The display lights up when the engine is running. The display is cleared if no button is pressed for 1 minute or no impulse is received from the wheel sensor. The button is used to change between display modes. The + and – buttons are used to control various functions

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2008 KTM 50 SX JUNIOR 50 SX OWNER'S MANUAL

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Filed Under (KTM) by admin on 22-10-2010

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Choke Dell’Orto carburetor PHVA 14 DS (50SXJunior) Choke lever [1] is mounted to the right side of the carburetor. If you move the choke lever up to the stop, a hole is opened in the carburetor through which the engine can draw in additional fuel. This results in a “rich” fuel-air mixture required for a cold start. Moving the choke lever back closes the hole in the carburetor again. Choke Dell’Orto carburetor PHBG 19 BS (50 SX) Choke control knob [2] is mounted to the left side of the carburetor. If you pull the choke control knob up to the stop and turn it 90º, a hole is opened in the carburetor through which the engine can draw additional fuel. This results in a “rich” fuel-air mixture required for a cold start. Turning back the choke control knob returns the knob to the starting position and closes the hole in the carburetor again. Kickstarter The kickstarter is mounted on the right side of the engine. Its upper part can be swivelled. Foot brake lever The foot brake lever is located in front of the right footrest. The basic position can be adjusted to the seating position (see maintenance work). Side stand (50 SXJunior) Use your foot to swing the side stand forwards to the stop. Make sure it rests securely on solid ground.

KTM 250F Timing Chain Tensioner Installation Instructions

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Filed Under (KTM) by admin on 19-10-2010

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1) Remove OEM Tensioner: On some models including the 250F motors, it may be necessary to put the engine at TDC before proceeding. Check your manual. This is not the case on the 450 and 530 single cam motors. • Remove the outer cover plug. • Remove the large cover with copper washer. • Using needle nose pliers grab the end of the OEM tensioner and pull it outward. Be careful not to damage the aluminum port or face. • If the O-ring did not come out with the tensioner, carefully reach into the port and remove it without pushing it further into the engine. 2) Install new Tensioner: • To prepare the new tensioner, set the spring aside. Put the new tensioner in the collapsed position. (They are packaged and shipped in the collapsed position.) If you have extended it, rotate the assembly until the “top” on the piston is facing up. Then a light tap from the bottom will release the ratchet. This will now allow the plunger to be retracted to about 1- 13/16″ (46mm). • Install the O-ring over the tensioner body, keeping it outboard of the ridge as shown. • Slide the tensioner assembly with O-ring (without the spring), into the engine port. The end (with the hex-head spring hole) should only protrude from the engine about 1/32″ (.75mm). • Install the cover and tighten. The copper washer should be tight. • Insert the spring through the cover port. As it is slowly inserted, you may hear clicks as it pushes the plunger inward while ratcheting. • Install and tighten the plug against the spring. Note: some 250F engines have a one piece cap. Slide the spring into the tensioner far enough to hold it, then capture it with the cap and tighten. • Start the engine and carefully check for oil leaks. Adjustment will occur internally as it is needed. No further maintenance of the tensioner is required

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