2 stroke 50cc carburetor adjustments

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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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HSR Carburetor Total Kits Installation Instructions

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Filed Under (Mikuni) by admin on 31-10-2010

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Intake Manifold: 1. Install MAP sensor in Mikuni manifold (Twin Cam only). 2. Attach the Mikuni manifold to the engine. Align the manifold before tightening the bolts. The flange surface of the Mikuni manifold should be parallel with the front of the engine’s cam cover. Use a level or angle meter to check this. Tighten the manifold bolts. 3. Attach the rubber flange to the Mikuni manifold with the furnished 5/16″x3/4″ bolts and washers. Choke Cables: Mikuni & Harley-Davidson Route the cable with largest radius bends possible. Check the cable for free-play after installation. If there is no free-play, the engine may run rich and deliver poor performance or low fuel mileage. Harley Cable (Twin Cam Kits: 42-19, 45-4) : 1. Remove the Harley choke cable from the stock carb. 2. Remove the spring and plunger from the cable. 3. Remove the spring and plunger from the Mikuni. 5. Install the Mikuni spring and plunger onto the Harley choke cable. Change nothing else; be sure to use the Harley plastic nut, not the Mikuni nut (See Figure 1). Total Kit Installation Instructions The HSR series carburetors are precise yet durable instruments; however, like any other piece of fine equipment, they require correct installation and reasonable care to assure optimum performance and long life. Extra time spent during installation will pay off in both short and long term performance and reliability. This Mikuni HSR carburetor kit is designed to be a bolt-on application, and as such, is set-up and jetted properly for most applications. However, since Harley-Davidson motors are often highly modified, alternate tuning settings may be required. The Mikuni Tuning Manual helps make jetting alterations and adjustments an easy matter. NOTE: Carburetor Kits not designated as C.A.R.B. exempt, are not legal for motor vehicles operated on public highways in the state of California, or in any other states and countries where similar laws apply. WARNING NOTE: NOTE: WARNING CAUTION NOTE: NOTE: TK-2 6. Install the new assembly into the Mikuni carburetor. Be careful to only gently tighten the plastic nut. 7. Loosen the knurled plastic friction nut behind the choke knob and check for free-play (see Figure 2). Figure 1: Harley nut with Mikuni spring & plunger Figure 2: Choke cable adjustments Mikuni Cable (Evo Kits: 42-8, 45-2 & 45-3) : 1. Remove nut, spring and plunger from the Mikuni. 2. Install the nut, spring and plunger onto the cable. 3. Install the assembly into the Mikuni HSR carburetor. Be careful to only gently tighten the plastic nut. 4. Check for free-play. Adjust the cable as necessary. An optional choke cable mounting bracket is included in the Evo kits for custom installations. Carburetor Installation: 1. Insert the carb fully into the rubber flange, align with engine and tighten the clamp. 2. Slip the fuel hose onto the carburetor’s fuel fitting and secure with the enclosed hose clamp. NOTE: Some Twin Cam installations may require removal of a small amount of fin material from the cylinders to clear the float bowl. Throttle Cables The HSR carburetor uses stock 1990 and later Harley- Davidson cables. However, if your Harley is fitted with some other carburetor, you may need to purchase a set of cables. See your dealer for the correct cable set. 1. Route the throttle cables with large radius curves and so they do not interfere with other components. 2. Screw the cable adjusters together to make them as short as possible. 3. Connect the “close” cable first (see Figure 3). 4. Install the “open” cable next (see Figure 3). 5. Adjust the opening cable until the slide can be opened fully. Snug the adjuster lock nut. 6. Turn the handlebar to the right and adjust the throttle free-play with the closing cable adjuster to approximately 1/8″ (see Figure 4)

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HARLEY DAVIDSON BIG TWIN SPIGET MOUNT CARBURETOR INSTALLATION MANUAL

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Filed Under (Harley Davidson) by admin on 26-03-2012

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A. BEFORE INSTALLATION OF YOUR NEW ZENITH CARBURETOR, NSPECT THE RUBBER MANIFOLD SEAL FOR NICKS,CRACKS, OR DEBRIS. APPLYING A LIGHT FILM OF PETROLEUM BASED LUBRICANT AROUND THE INSIDE LIP OF THE RUBBER SEAL WILL ALLOW THE CARBURETOR TO SLIP INTO PLACE EASIER. B. BEFORE ACTUAL INSTALLATION OF UNIT INTO MANIFOLD, THROTTLE CABLES SHOULD BE HOOKED TO THETHROTTLEWHEEL.MAKESURETHATTHE PULL CABLE IS LOCATEDPROPERLY TO OPEN THE THROTTLE PLATE (IN SOME APPLICATIONS THROTTLE CABLE SLACK MAY NEED TO BE ADJUSTED FOR PROPER HOOKUP AND OPERATION) SEE FIG. #1 C. AFTER THROTTLE CABLES ARE PROPERLY HOOKED UP,UNITCAN BE INSERTED INTO MANIFOLD. MAKE SURE THAT UNIT IS FULLY SEATED. WITH CARBURETOR SEATED INTO MANIFOLD AND FUEL LINE HOOKED UP TO FUEL INLET, INSTALL CHOKE CABLE AND HOOK TO CHOKE LEVER. PLACE AIR INTAKE GASKET ON END OF CARBURETOR, NEXT PLACE INTAKE ADAPTOR OVER INTAKE GASKET. SEE FIG#2 ZENITH MOD.16P12 SPIGET MOUNT CARBURETOR -HARLEY DAVIDSON ™ BIG TWIN INSTALLATION INSTRUCTIONS FIG. # 1 FIG. # 2 D. WITH ADAPTOR IN PLACE, LOCATE THE STOCK AIR BOX OVER THE ADAPTOR, UTILIZING THE STOCK AIR BOX GASKET (THERESHOULDBENO GAPS BETWEEN ADAPTOR, AIRBOX OR CARBURETOR WHEN PROPERLY INSTALLED) STAND-OFF SPACERS PROVIDED ARE TOBEPLACEDBETWEENAIR BOX& ENGINE HEADS BEFORE INSTALLING THE VENT/RETAINING BOLTS. FOR EVALUATION ENGINES STOCK VENT BOLTS CAN BE USED WITH LARGERI.D. SPACER PROVIDED. SEE FIG#3 E. WITH AIR BOXSECURELY IN PLACE, INSTALL THE AIR FILTER COVER RETAINING BRACKET AND FILTER USING THE STOCKBOLTS, AND REPLACE AIR FILTER COVER AND SECURE WITH STOCK BOLT. SEE FIG#4 F. AFTER INSTALLATION IS COMPLETE AND FUEL FLOW HAS BEEN RE-ESTABLISHED, CHECK FOR ANY LEAKS BEFORE STARTING ENGINE. H. AFTER STARTING ENGINE, SOME ADJUSTMENTS OF IDLE AND MAIN JET MAYBE REQUIRED FOR PROPER OPERATION. AFTER ADJUSTMENTS HAVE BEEN MADE AND WITH ENGINEAT IDLE, TURN WHEEL FULLYTOLEFTANDRIGHT.ANYCHANGEIN IDLE SPEED INDICATES THROTTLE CABLES ARE TOO TIGHT AND MORE SLACK MUST BE PROVIDED.

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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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Vespa GTS Super Specification

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Filed Under (Vespa) by admin on 11-11-2010

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Gts super 300 ie Gts super 125 ie s 125cc s 50cc Gts 250 ie Gts 125cc LX 125cc LX 50cc 2 stroke Engine Single-cylinder, catalised, QUASAR 4 stroke, 4 valve electronic injection Single-cylinder LEADER 4 stroke with electronic injection Single-cylinder LEADER 4 stroke Single-cylinder HI-PER 2 stroke Single-cylinder, catalised, QUASAR 4 stroke, 4 valve electronic injection Single-cylinder, catalised, LEADER 4 stroke, 4 valve Single-cylinder LEADER 4 stroke Single-cylinder HI-PER 2 stroke Capacity 278cc 124cc 124cc 50cc 249cc 124cc 124cc 49cc Power 16.4 kW / 7500 rpm 10.5 Kw / 9500 rpm 7.65 Kw / 8250 rpm 3.2 Kw / 7500 rpm 15.7 Kw / 8500 rpm 7.65 Kw / 8250 rpm 7.65 Kw / 8250 rpm 2.5 Kw / 8500 rpm Max Torque 22Nm / 6500 rpm 12 Nm / 8000rpm 9.6 Nm / 7250 rpm 4.4 Nm / 6500 rpm 20.1 Nm / 6500 rpm 9.6 Nm / 7250 rpm 9.6 Nm / 7250 rpm 3.3 Nm / 6500 rpm Cooling Liquid Liquid Forced Air Forced Air Liquid Liquid Forced Air Forced Air Starter Electric Electric Electric and kick starter Electric and kick starter Electric Electric Electric and kick starter Electric and kick starter Transmission Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Automatic twist and go Front Suspension Single arm, dual chamber hydraulic shock absorber with coaxial spring Single arm link with coil spring and double hydraulic shock absorber Single arm link with coil spring and double hydraulic shock absorber Single arm link with coil spring and double hydraulic shock absorber Single sided trailing link with hydraulic shock absorber Single sided trailing link with hydraulic shock absorber Single sided trailing link with hydraulic shock absorber Single sided trailing link with hydraulic shock absorber Rear Suspension Two dual effect shock absorbers with adjustable preload Coil spring and double hydraulic shock absorber Coil spring and double hydraulic shock absorber Coil spring and double hydraulic shock absorber Twin hydraulic shock absorbers with preload adjuster Twin hydraulic shock absorbers with preload adjuster Hydraulic shock absorbers with preload adjuster Hydraulic shock absorber Front Brake ø 220mm disc brake 220mm disc brake ø 200mm disc brake ø 200mm disc brake ø 220mm disc brake ø 220mm disc brake ø 200mm disc brake ø 200mm disc brake Rear Brake ø 220mm disc brake 220mm disc brake ø 110mm drum brake ø 110mm drum brake ø 220mm disc brake ø 220mm disc brake ø 110mm drum brake ø 110mm drum brake Front Tyre Tubeless 120/70-12″ Tubeless 120/70 – 12″ Tubeless 110/70 – 11″ Tubeless 110/70 – 11″ Tubeless 120/70-12″ Tubeless 120/70-12″ Tubeless 110/70 – 11″ Tubeless 110/70-11″ Rear Tyre Tubeless 130/70-12″ Tubeless 130/70 – 12″ Tubeless 120/70 – 10″ Tubeless 120/70 – 10″ Tubeless 130/70-12″ Tubeless 130/70-12″ Tubeless 120/70 – 10″ Tubeless 120/70-10″ Running weight 158kg 158kg 114kg 96kg 151kg 145kg 114kg 96kg Length/Width/Height 2230mm / 755mm / 1170mm 1930mm / 755mm / 1930mm 1770mm / 740mm / 1140mm 1755mm / 740mm / 1140mm 1930mm / 755mm / 1170 mm 1940mm / 755mm / 1180 mm 1770mm / 740mm / 1140mm 1755mm / 740mm / 1140mm Fuel Tank Capacity 9 litres 9 litres 8.5 litres 8.5 litres 9.2 litres 10 litres 8.5 litres 8.5 litres Emmissions Euro 3 Euro 3 Euro 3 Euro 2 Euro 3 Euro 3 Euro 3 Euro 2 Colours Rosso Dragon Nero Lucido Montebianco Rosso Dragon Nero Lucido Montebianco Taormina Nero Lucido Montebianco Taormina Nero Lucido Montebianco Marrone Terra Di Toscana Bronzo Perseo Nero Vulcano Blu Midnight

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Cobra Motorcycle and ATV Specifications CX65 CX50 Sr. (The King) CX50 Jr. ECX 70 ECX 50 ECX80AC

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Filed Under (Cobra) by admin on 14-11-2010

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Dry Weight 122 lbs 91 lbs 81 lbs 210 lbs 206 lbs 210 lbs Engine Cobra 65cc 2-stroke Cobra 50cc 2-stroke Cobra 50cc 2-stroke Cobra 70cc 2-stroke Cobra 50cc 2-stroke Cobra 80cc 2-stroke Bore x Stroke 44.5mm x 41.7mm 39mm x 41.7mm 39mm x 41.7mm 44.5mm x 44.7mm 39mm x 41.7mm 47.6 mm x 44.7mm Induction Case Reed V-Force® Reed Valve- 24mm Mikuni carb Case Reed Carbon Pedal 19mm carb Case Reed Carbon Pedal 14mm carb Case Reed V-Force® Reed Valve- 24mm Mikuni carb Case Reed Carbon Pedal 21mm carb Case Reed V-Force® Reed Valve- 24mm Mikuni carb Cooling Water cooled Cylinder and Case Water cooled Water cooled Water cooled Cylinder and Case Water cooled Water cooled Cylinder and Case Clutch Hydraulic ally actuated Cobra 3Gx 3-Shoe Cobra 3Gx 3-Shoe Hydraulic ally actuated – (auto option) Cobra 3Gx 3-Shoe Rekluse Z-ball auto-clutch Transmission Six-speed sequential Single-speed auto Single-speed auto Six-speed sequential Single-speed auto Six-speed sequential Exhaust Tuned pipe and silencer Tuned pipe and silencer Tuned pipe and silencer Tuned pipe and silencer Tuned pipe and silencer Tuned pipe and silencer Lubrication Mixture lubrication Mixture lubrication Mixture lubrication Mixture lubrication Mixture lubrication Mixture lubrication Fuel Capacity 1.06 Gallons .85 Gallons .70 Gallons 1.9 Gallons 1.9 Gallons 1.9 Gallons Frame Twin Spar Oval HSLA Double Cradle 4130 ChrMo Steel Double Cradle 4130 ChrMo Steel Arens design twin spar Arens design twin spar Arens design twin spar Wheelbase 1140mm 990 mm 908 mm 1067mm (track 915mm) 1067mm (track 915mm) 1067mm (track 915mm) Seat Height 762mm 680 mm 607 mm 762 mm 737 mm 762mm Ground Clearance 250mm 240 mm 216 mm 205 mm 205 mm 205mm Front Brakes Hydraulic Disk (205mm) Hydraulic Disk (160mm) Hydraulic Disk (160mm) Hydraulic Disk (160mm) Hydraulic Disk (160mm) Hydraulic Disk (160mm) Rear Brakes Hydraulic Disk (165mm) Hydraulic Disk (140mm) Adjustable Drum Hydraulic Disk (180mm) Hydraulic Disk (180mm) Hydraulic Disk (180mm) Front Suspension Marzocchi 35mm USD Adjustable 220mm travel Cobra 30mm USD 210mm travel Marzocchi 32mm 168mm travel Dual A-Arm with SVO™ patented steering design. 248mm travel Dual A-Arm with SVO™ patented steering design. 248mm travel Dual A-Arm with SVO™ patented steering design. 248mm travel Rear Suspension Öhlins Fully Adjustable 270mm travel Fox Piggyback Fully Adjustable 248mm travel Öhlins Piggyback 170mm travel Fox Piggyback 220mm travel Solid axle Fox Piggyback 220mm travel Lightweight tube axle Fox Piggyback 220mm travel Solid axle Wheel Front / Rear 14″ spoke / 12″ spoke (Al rims, Billet hubs, 9ga. spokes) Cobra 12″ Billet Cobra 10″ Billet Cobra 10″ Billet Cobra 10″ Billet ITP 10×5 (4 x1) Al Douglas 8×6.5 (4×2.5) Al ITP 10×5 (4 x1) Al Douglas 8×6.5 (4×2.5) Al ITP 10×5 (4 x1) Al Douglas 8×6.5 (4×2.5) Al Tires Front / Rear 60-100×14 Dunlop 80-100×12 Dunlop 2.5×12 / 2.75×10 2.5×10 / 2.75×10 ITP Holeshot 19/6 ITP 16/6.50-9 ITP Holeshot 19/6 ITP 16/6.50-9 ITP Holeshot 19/6 ITP 16/6.50-9

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HOVELHEAD & IRONHEADXL 42mm Mikuni Carburetor And Manifold Kit INSTALLATION Instructions

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Filed Under (Tips and Review) by admin on 31-10-2010

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THROTTLE CABLE ADJUSTMENT A) Rotate the throttle grip to the full open position, look into the throttle bore and see if the throttle valve (slide) opens completely. If the throttle valve does not open completely unscrew the adjuster on the opening cable until it does. This adjustment should be made carefully to assure maximum carburetor performance. After adjustment tighten the adjuster jam nut. B) After adjusting the open cable, adjust throttle freeplay with the closing (idle) cable to approximately 1/8″ an indicated in the following illustration. note It is very important to adjust the cables in the preceding described manner to ensure that the idle cable operates correctly for safety. It must close the throttle completely 2 PLEASE NOTE USE CAUTION PLEASE NOTE SAFETY WARNING pull open cable pull close cable SHOVELHEAD/IRONHEAD XL Installation Instructions Check and make sure that the throttle cables are routed properly by rechecking the throttle play as the handlebars are turned from side-to-side; the amount play should remain consistent. C) After the throttle cables have been adjusted, make sure that all the lock nuts are securely tightened. 5. AIR CLEANER A) The air filter bracket is attached to the crankcase with 1 long bolt, and a bracket-spacer. Removed the crankcase nut located between the tappet blocks & replace it with the enclosed bracket spacer; tighten the spacer securely. B) Remove the stud protectors from the K&N filter and place the two backing plates on the studs. Now slip the the filter onto the carburetor. C) Attach the 2 long brackets to the air filter studs with the enclosed nuts & flat washers, and to the bracket spacer with the enclosed bolt using the lock washers, and flat washers. When the carburetor and air cleaner are properly aligned, securely tighten all of the mounting hardware including the intake manifold clamps. In some cases it may be necessary to bend the brackets slightly to arrive at the correct fit. D) Use the enclosed hose clamps to secure the fuel hose to the petcock, and the HSR carburetor. The screw clamp goes on the petcock end and the spring clamp attaches to the carburetor end. E) Attach the chrome air filter cover with the enclosed socket head screw. 7. CHOKE CABLE INSTALLATION A) Attach the Mikuni choke cable bracket to the original choke cable bracket on the air cleaner stud with the enclose hardware as illustrated

HSR Carburetor Total Kits Installation And Tuning Manual

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Filed Under (Tips and Review) by admin on 31-10-2010

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1. Disconnect the battery ground wire from the battery. 2. Turn the fuel petcock to the “OFF” position. 3. Elevate the rear of the fuel tank for better access to the carburetor area. 4. Remove the coil, horn or other devices on the left hand side of the engine to allow free access to the intake manifold bolts. 5. Remove the complete air cleaner assembly, including the backing plate. 6. Disconnect any vacuum hoses and the fuel hose from the stock carburetor. 7. Disconnect the choke cable from the frame. 8. Remove the stock carburetor. 9. Evo: remove the stock manifold. 10. Twin Cam: unplug MAP sensor, remove manifold and then remove the MAP sensor from the manifold. Installation: Intake Manifold: Twin Cam only: Install MAP sensor in Mikuni manifold. 1. Attach the Mikuni manifold to the engine. Align the manifold before tightening the bolts. The flange surface of the Mikuni manifold should be parallel with the front of the engine’s cam cover. Use a level or angle meter to check this. Tighten the manifold bolts. 2. Attach the rubber flange to the Mikuni manifold with the 5/16″x3/4″ bolts and washers. To ease installation, use liqiud detergent to lubricate the manifold seals. Choke: Evo: We recommend that you use the Mikuni choke cable that is furnished with the carburetor. However, you can use the stock Harley cable (’90-’99 models only) if you follow the Twin Cam choke cable instructions. Twin Cam: 1. Remove the Harley choke cable from the stock carb. 2. Remove the Harley spring and plunger from the Harley choke cable. 3. Remove the Mikuni spring and plunger from the Mikuni carburetor. 5. Install the Mikuni spring and plunger onto the Harley choke cable. Change nothing else; be sure to use the Harley plastic nut, not the Mikuni nut. 6. Install the new assembly into the Mikuni. Be careful to only gently tighten the plastic nut.

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Tuning the HSR42/ 45 Carburetor

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Filed Under (Tips and Review) by admin on 31-10-2010

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your Mikuni HSR is fitted with the tuning parts we found to work with the great majority of engine performance modifications. However, the large number of differing exhaust systems and cams available makes it impossible to accommodate all possible combinations with one carburetor set-up. Your HSR will almost certainly run correctly on your engine without exchanging any parts. But, if it doesn’t, you may alter its tuning to suit your engine’s needs by following this guide. Some exhaust system designs strongly interfere with carburetor tuning. For instance, it is very difficult to get smooth and responsive carburetion through the entire rpm range with straight pipes and completely open exhausts. In addition, very small volume, small diameter mufflers are often ‘seen’ by the engine as straight pipes and present the same tuning difficulties. Very long duration cams often cause relatively poor running below about 3,000 rpm, depending upon the individual cam’s intake valve closing point. Such cams cause reverse airflow out the mouth of the carburetor (often called “reversion” or “standoff”) that can be mistaken for a carburetor tuning problem. Harley-Davidson Screamin’ Eagle performance parts are proven and predictable. If you have any doubts about a particular exhaust system, air cleaner or ignition, you may substitute the Harley Screamin’ Eagle parts as a “reality check.” When re-tuning is required, it usually involves small alterations to the idle and/or main system. The following pages supply enough information to make such alterations relatively simple. Please note that there is no point in attempting to tune any carburetor unless the engine is sound and in a good state of tune. If you have any doubts about the general condition of your engine, have it checked by your dealer or an experienced mechanic before attempting to fine-tune your Mikuni.

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YAMAHA RAPTOR 350 Removing stock carburetor and cables

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Filed Under (Yamaha) by admin on 18-01-2012

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remove seat and gas tank. Make sure fuel petcock is in “off” position. 2. Remove throttle cable paying close attention to routing, as the new cable (s) will need too be routed the same. 3. Remove stock carburetor and stock throttle housing. Stuff a clean, dry rag into manifold to keep debris out of motor. 4. Remove stock air box. 5. Remove choke cable from handlebars. 6. Remove carb vent line from bike. Carburetor installation 1. Carefully trim the rubber alignment tab off of the face of the manifold with a razor blade or side cutters. 2. Remove the hex pipe plug from the carb cap using a 11mm or 7/16 wrench. Do not discard plug, as it will be needed later. Install the metering adjustment tool included in the hardware kit. Do not over-tighten as damage may occur to cap. 3. Attach fuel line to carburetor and secure with clamp. 4. Install remote idle cable into tab on top of carburetor. See main manual for this step. NOTE: Nut must be removed from cable before installation 5. Place carburetor into manifold

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