2003 ktm 250sx stock main jet

You search Auto repair manual PDF 2003 ktm 250sx stock main jet, if there are search results will appear below. If search results do not exist, please search by others keyword.

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

0

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

download
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:

Honda TRX 400EX INSTALLATION And REMOVAL INSTRUCTIONS

0

Filed Under (Honda) by admin on 14-12-2011

download
Quiet cores are supplied with this kit but not installed. To install the quiet cores remove both rear end caps ((turn downs) and install the quiet cores with the tubes facing inward. Re-install the end caps. REMOVAL Remove seat, disconnect attery and remove. Remove front fenders and side skirts. Remove fuel tank (make sure to shut fuel off and drain remaining fuel in the line before removing). Remove stock muffler first, then remove stock headers. Retain the 4 stock header bolts to install on your new exhaust system. Remove the rear bolt from your stock air box. Loosen stock intake clamp at carburetor. Remove stock boost bottle from the side of the boot. Loosen stock snorkel clamp at the air box, remove stock retaining clip at the front of the snorkel. Remove stock air box, intake boot and snorkel together from the ATV. Slide tarter solenoid off of stock mounting prongs. Remove Phillips screws from fuse holder and remove from plastic housing. Remove plastic battery housing from the ATV. Unplug tail light from harness. Unclip harness from the 2 clips above the battery. CARBURATION Now would be a good time to replace your stock main jet, with the supplied 190 main jet and replace your stock pilot jet with the supplied 48 pilot jet. Make certain that all hoses are tight and routed as stock. Be certain carb clamp is tight when re-installed. INTAKE BOOT Remove the intake boot from the stock air box. Take an exacto knife or razor blade and trim off the rubber piece that the hard plastic snorkel slips into. Trim around the intake boot staying the same distance as the rest of the lip. Take a hax saw and cut the groove as the rest of the boot is, being
careful not to cut all the way through (Picture Fig.2).

Triumph SU CARBURETORS SERVICING AND TUNING

0

Filed Under (Triumph) by admin on 29-10-2010

download
Jets: These are made in various sizes ranging from.099 inches to.1875 inches, the larger sizes being used only for racing or very high performance engines. The two sizes most commonly found on production cars are the.090 inch and the.100 inch. The size of the jet will be found stamped on the jet head. The figure “nine”wilt indicate that it is the.090 inch and the figure “one”will indicate the.100 inch jet. When tuninga production car the jets size should be checked to make sure that it is of the size recommended by the manufacturers. Centering of Jet: If for any reason, the jet assembly has been removed, it will be ne cessary to recenter the jet. First, remove the clevis pin at the base of the jet which attaches the jet head to the jet operating lever. Withdraw the jet completely and remove the adjusting nut and spring, then replace the adjusting nut, without its spring, and screw it up toits highest position. Slide the Set into position until the jet head is against the base of the adjusting nut. When this has been done, find out if the piston is perfectly free by lifting it up with the finger and allowing it to drop. If the piston is not entirely free, slacken the jet screw and manipulate the lower part of the assembly, including the projecting part of the bottom half of the jet bearing, adjusting nut, and jet head. Make sure that this assembly is now slightly loose. The piston should then rise and fall quite freely as the needle is now able to move the jet into the required central position. The jet screw should now be tightened and a further check made to determine that the piston is still quite free. When complete freedom of the piston is achieved the jet adjusting nut should be removed, together with the jet, and the spring replaced. Experience has shown that a large percentage of carburetors, which have given trouble has been due to the incorrect centering of jets. Jet Needles— These are made in a great variety of sizes, probably now well over two hundred and fifty, and each type of engine hasaneedlethat has been selected, after very careful tests have been carried out, to give the best all-round performance. Most manufacturers actually give three alternative needles for each type and size of engine, these needles clearly being listed by the manufacturer “Standard”, “Rich”or”Weak”and before tuning is started the needle, which is marked on the shank should be checked against the manufacturer’srecommendation to make quite sure that the right needle is fitted; this is most important.

2000-2003 KTM MXC / EXC Dual Sport Kit Installation And Removal Manual

0

Filed Under (KTM) by admin on 08-02-2012

download
00-’03 KTM 400/450/520/525 EXC & MXC Dual Sport Kit Installation Manual 1. Get a degree in Mechanical and Electrical Engineering. (Just kidding!) 2. Remove the seat, fuel tank, and side panels. Stock switch Bracket Photo 2 EXC – Unplug and remove the stock headlight. (Photo 2.) Unplug the stock three-pin taillight connector and pull the taillight wires back to the rear of the airbox temporarily. MXC – Remove the stock front number plate. 3. Make sure the stock battery is oriented in its mounting bracket as shown with the positive terminal on the left side of the bike (as viewed if sitting on the bike). If not, remove and spin it 180 degrees. Photo 3
4. MXC ONLY! (EXC skip this step.) Locate the stock lighting wiring harness zip-tied under the frame back-bone (See Photo 4). Remove the securing zip-ties and route this wiring forward to the area behind the headlight. Route along right side of frame using factory wire- guide clamp. 5. Brake Light Switch Installation: The KTM kit uses a hydraulic brake-switch. This requires replacing the rear master cylinder banjo bolt with a specially made switch. Installing the switch requires bleeding the brake. If you do not feel competent bleeding your rear brake, please refer this job to a qualified mechanic, as failure to do it correctly will make the brake inoperable. Remove the stock banjo bolt and replace with the hydraulic switch as shown. Make sure to install

2000-2003 KTM MXC / EXC Dual Sport Kit Installation Manual

0

Filed Under (KTM) by admin on 01-02-2012

download
Get a degree in Mechanical and Electrical Engineering. (Just kidding!) 2. Remove the seat, fuel tank, and side panels. Stock switch Bracket Photo 2 EXC – Unplug and remove the stock headlight. (Photo 2.) Unplug the stock three-pin taillight connector and pull the taillight wires back to the rear of the airbox temporarily. MXC – Remove the stock front number plate. 3. Make sure the stock battery is oriented in its mounting bracket as shown with the positive terminal on the left side of the bike (as viewed if sitting on the bike). If not, remove and spin it 180 degrees. Photo 3 4. MXC ONLY! (EXC skip this step.) Locate the stock lighting wiring harness zip-tied under the frame back-bone (See Photo 4). Remove the securing zip-ties and route this wiring forward to the area behind the headlight. Route along right side of frame using factory wire- guide clamp. 5. Brake Light Switch Installation: The KTM kit uses a hydraulic brake-switch. This requires replacing the rear master cylinder banjo bolt with a specially made switch. Installing the switch requires bleeding the brake. If you do not feel competent bleeding your rear brake, please refer this job to a qualified mechanic, as failure to do it correctly will make the brake inoperable. Remove the stock banjo bolt and replace with the hydraulic switch as shown. Make sure to install