2003 ktm 250sx stock main jet

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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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Honda TRX 400EX INSTALLATION And REMOVAL INSTRUCTIONS

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

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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).

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Triumph SU CARBURETORS SERVICING AND TUNING

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

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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.

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

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

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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

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

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

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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

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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2000-2010 KTM X2 SWITCH WIRING HARNESS Removal and Installation Manual

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Filed Under (KTM) by admin on 25-01-2012

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The included 3600-SWHA switch harness is intended for use with offroad models that do not come with a Hi/Low beam switch from the factory. The harness is compatable with stock AC lighting electrical systems as well as high output DC electrical systems. 1. Remove the stock numberplate or headlight. Remove the stock kill switch from handlebars and replace with the 3600-SWHA switch. 2. Remove the gas tank. Route the white and black leads from the 3600-SWHA under the tank following the wires from the stock kill switch. Disconnect the stock kill switch bullet and connect the white wire of the 3600-SWHA to the wiring harness. Disconnect the stock kill switch ring terminal and connect the ring terminal of the 3600-SWHA. Fully remove the stock kill switch. Be sure all the wires are safe from being burned or pinched and re-install the gas tank. 3. Disconnect the two female spade terminals from the stock headlight switch (if present). Connect the terminal with the yellow wire to the red power lead from the switch. Connect the white wire to the blue accessory output from the switch. Be sure the clear silicone sleeves are covering the stock plastic housings. 4. Connect the X2 headlight to the switch headlight plug. Note: The stock headlight plug will not be used for the X2 installation, but is still functional for connecting the stock headlight. The stock plug will turn on and off with the new headlight switch, and will be powered in either of the Low or High Beam positions

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Yamaha V-Star 1100 Needle/ Jet Kit REMOVAL AND INSTALLATION MANUALS

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Filed Under (Honda) by admin on 27-12-2011

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To install this needle and jet kit: • Remove carburetors from the engine per Yamaha shop manual procedures. Note: Always perform internal carburetor work in a clean area. • Remove the vacuum slide from each carburetor. • Remove the OEM needle, spacer and washers, noting order of assembly. (Note; the washers are used as shims to raise the needle, each is equivalent to ½ clip position, use these to fine tune the needle) • Counting from the top to the bottom, install the new Baron needle clip on groove #4 of the replacement Baron adjustable needles. The top is the blunt end of the needle. • Reinstall the OEM spacer and washers as shown in the figure below. • Reinstall the vacuum slides along with the diaphragm spring and reattach the diaphragm covers Note: Verify that the slides maintain their full range of movement! • Drain the fuel from the float bowls and remove the bowl covers. • Remove the OEM main jets and replace them with Baron’s supplied Mikuni main jets. Install the “base setting” main jets as indicated above. NOTE: V-Star 1100 carburetion runs staggered jetting! Make sure the front cylinder’s carburetor gets the larger main jet (numerically), and the rear cylinder’s carburetor gets the smaller main jet . Important! Extra jets have been included in your kit. These will help you fine-tune the carburetors for changing conditions. These conditions include climate and weather patterns in your area as well as exhaust equipment on your motorcycle. Barons determines the jet and clip recommendations that best suit your average riding conditions based upon information supplied to us at the time of your order. Changes in weather, altitude or modifications to your exhaust system may require jets other than those supplied. • Thoroughly clean the inside of the float bowls prior to reinstalling them. 311 #1 Industrial Way – Fallbrook, CA 92028 – USA Phone: (760) 731-1200 Fax: (760) 731-1284 E-mail: tech@baronscustom.com Website: www.baronscustom.com Included in this kit: (4)Mikuni main jets #107.5, 110, 112.5, 115, (2) titanium needles, (2) clips, (8) cap-head allen screws Tools required: 3-4-5 mm allen wrenches, 10&12 mm sockets, 10mm end wrench, phillips & flat screwdrivers, pliers, drill. Revision 4.0 • Reassemble the carburetors by reversing the order of above steps. Use the new supplied cap head Allen screws in place of the OEM Phillips head screws for the float bowls. • Locate the fuel mixture screws – they will either be a screw head or a brass plug. If it is a screw head, skip to step c . If you see a brass plug with a small hole in the center, proceed as follows: a. With a 5/32″ drill bit, carefully and slowly drill through the fuel mixture plugs

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KTM ELECTRICAL SYSTEMS INSTALLATION, REPAIR

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

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DC SYSTEMS STEP DC1 – REGULATOR/RECTIFIER: PRE-2005 KTM If the stock regulator looks like below (the stock connector will not plug into the Trail Tech regulator/rectifier) then the provided stub connector must be soldered into the bike’s wire harness. For models without a stock battery, mount the reg/rec and plug the stub connector into it. Run the red and black wires directly to the (aftermarket) battery, and the yellow wires to the stator. SEE DC CIRCUIT DIAGRAM ON REVERSE SIDE OF PAGE. MODELS WITHOUT A STOCK BATTERY Move stock light to the DC circuit: divert lighting wire from AC circuit to DC circuit. In stock form, the lights are powered by the AC half of the electrical system. In order to continue to use the stock light, find the yellow wire (runs to stock headlight) shown below (wire bundles are found underneath gas tank) and cut the smaller gauge yellow wire. 1. Connect aftermarket light: Wire the light’s red(+) light lead to the positive(+) battery terminal, and the black(-) light lead to the negative(-) battery terminal. Trail Tech lights should use a 10-20 amp fuse as close to the positive(+) battery terminal as possible.

Yamaha Road Star NEEDLE/ JET KIT INSTALLATION INSTRUCTIONS

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Filed Under (Yamaha) by admin on 10-11-2010

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1. Remove the vacuum slide from the carburetor. 2. Remove the OEM needle, spacer and washers, noting order of assembly. 3. Counting from the top to the bottom, install the new Baron needle clip on groove #4 for 04-07 models and on groove #5 for 99-03 models of the replacement. NOTE: Baron adjustable needle – The top is the blunt end of the needle. 4. Reinstall the OEM spacer and washers as shown in this diagram. 5. Reinstall the vacuum slide along with the diaphragm spring. 6. Reattach the diaphragm cover back and tighten screws. NOTE: Verify that the slide maintains its full range of movement. 7. Drain the fuel from the float bowl and remove the bowl cover. 8. Remove the OEM main jet and replace it with a Barons genuine Mikuni main jet. Install the correct main jet as indicated in JET SELECTION area above on this page. Our install guides provide a basic outline on the proper installation of our products. Further tuning and/or fitment may be required. Page: 2 BA-2420RD NEEDLE/JET KIT – Yamaha Road Star (99-07) 9. Thoroughly clean the inside of the float bowl prior to reinstalling it. 10. Reassemble the carburetor by reversing the order of step #1 through step #10. Use the new cap head allen screws in place of the OEM phillips head screws. 11. Locate the fuel mixture screw – it will either be a screw head or a brass plug. If it is a screw head, skip to step #11c. 11c. If you see a brass plug with a small hole in the center, proceed as follows: With the drill bit, carefully and slowly drill through the fuel mixture plug. CAUTION: The fuel mixture screw is located directly beneath this plug. Be prepared to stop the drill and remove the bit the instant you break through the plug. Insert the self-tapping sheet metal screw into the drilled hole and remove the plug. With air/fuel screw now accessible, use a flat blade screwdriver to turn the screw clockwise until it seats, then carefully turn it counter-clockwise 3 1/2 turns. Refer to step #16 for assistance in fine tuning the setting of the air/fuel adjustment screw. 12. Reinstall the carburetor. We strongly suggest that you attach the throttle cables prior to mounting to intake manifold. 13. Reconnect the fuel line, ensuring the clamp is firmly in place. 14. Reinstall all vent hoses and electrical connectors that were previously removed, checking for any obstructions or blockage. 15. Reinstall the OEM air filter assembly or, if you are installing our Big Air Kit (BAK), follow the instructions that accompany that kit, then continue with next step. NOTES: When the BAK is installed, the vent hose that terminated on the rear of the OEM airbox can be relocated in any safe position that does not kink or pinch it. It is important to verify proper throttle operation before starting the engine.

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