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MIKUNI VM CARBURETOR SUPER TUNING

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

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This manual is intended as a guide for users of Mikuni carburetors who want to learn the adjusting method to the best performance from our products. In motorcycles, special tuning of the engine is now considereda routine practice. The arrows that appear in the drawings in this text show the direction in which air, fuel and an air-fuel mixture flows, respectively. ¢JAir Fuel “Mixture Mounting angle fore and aft inclination of the carb should not exceed approx Function of a carburetor The function of a carburetor is to produce combustible air-fuel mixture, by breaking fuel into tiny particles (in the form of vapor) and by mixing the fuel with air in a proper ratio, and to deliver the mixture to the engine. A proper ratio (mixture ratio or air-fuel ratio) means an ideal air-fuel mixture that can burn without leaving an excess of fuel or air, Whether the proper mixture ratio is maintained or not holds the key to the efficient engine operation, 2. Air-fuel mixture required by the engine (Fig. 1) The ratio of a mixture of fuel and air is called the mixture ratio or the air-fuel ratio and is generally expressed by the weight proportion. Theoretically, the amount of air required for complete combustion of 1 gram of fuel under normal conditions is

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Honda CARBURETOR ADJUSTMENT TOOLS

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Filed Under (Honda) by admin on 17-12-2011

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K&L CARBURETOR ADJUSTMENT WRENCHES These tools use tough and accurate bevel gear actuation instead of cable for professional use. The aluminum handle includes index marks for accurate tuning. Sold each. Three types available: 35-9653 Slot-type Pilot Screw Adjustment Wrench for Kawasaki/Suzuki/Yamaha 35-9658 Slot-type Pilot Screw Adjustment Wrench with longer tip for Kawasaki/Suzuki/Yamaha 35-9650 D-type Keihin Pilot Screw Adjustment Wrench for Honda 90-DEGREE 1/4″ HEX DRIVER This gear driven, 1/4″ hex driver set is made of high-grade aluminum and stainless steel. Strongest tool of it’s type on the market. Designed for use on hard-to-reach pilot air screws on inline fours. Can be used with any 1/4″ or 6mm hex bits. 35-7820 90-Degree 1/4″ Hex Driver Set: Includes straight slot, phillips, d-shape pilot screw bit, 6mm hex jet bit & 1/4″ – hex – 1/4″ drive bit. FCR CARB TOOL Set includes three bits – 6mm hex for main jets, long reach straight slot for pilot jets and 3mm allen for float bowl removal. Longer bits make this set ideal for reaching into recessed cavities when adjusting Keihin FCR carburetors. Sold as a set. 35-7978 FCR Carb Tool 12″ DRILL BIT For removal of carburetor plug. (mixture screw plug) 1/8″ bit x 12 inch length. 35-1186 YM-33217-16 JET DRIVER 35-2270 Perfect for removal of jets from small recessed passages

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HARLEY DAVIDSON PREMIUM SUSPENSION KIT REMOVAL AND INSTALLATION MANUAL

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Filed Under (Harley Davidson) by admin on 09-03-2011

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REMOVAL Front Fork Assembly 1. Refer to the XR model section of the service manual and remove the front forks. INSTALLATION Front Fork Assembly 1. Install front forks from kit to motorcycle according to service manual instructions but do not tighten the fork bracket pinch screws at this time. 2. See Figure 1. Measure the distance from the top of upper fork bracket to top of fork assembly. Both sides must be exactly the same and measure 0.388-0.468 inch (9.85- 11.89 mm) above the top fork bracket. Align the adjustment screws inline with the handlebars (see Figure 5). is06083a Figure 1. Fork Installation Height Measurement. NOTE If new pinch screws are not readily available, use a wire grinder wheel to remove all remaining lock patch from original pinch screws, wash screws in clean solvent and dry thoroughly. Apply two drops of LOCTITE® 262 to the first 1/4 in. (6.35 mm) of the end threads. 3. Install pinch screws to upper and lower fork brackets. 4. Verify fork tube installation measurement is 0.388-0.468 inch (9.85-11.89 mm). 5. Tighten pinch screws to 30-35 ft-lbs ( (40.7-47.5 Nm)) See Figure 2. The top edge of reflector should be 1-1/2 inches (38.10 mm) below the lower edge of the bottom fork clamp. 6. Remove the adhesive backing. Place reflector in position and press reflector firmly into place to activate the adhesive. Repeat for reflector on opposite fork. REMOVAL OEM Rear Shock Absorbers 1. Refer to the XR model section of the service manual and remove the rear shock absorbers. INSTALLATION Rear Shock Absorbers 1. See Figure 3. Install the rear shock absorbers according to service manual instructions. The shocks are installed with the external gas reservoir to the rear of the shock absorbers and the thick side of the grommet installed to the frame rail mounts. is06142 Figure 3. Install Thick Side Of Grommet To Frame Rail SUSPENSION ADJUSTMENTS Front Fork Suspension Adjustment Whenever a wheel is installed and before moving the motorcycle, pump brakes to build brake system pressure. Insufficient pressure can adversely affect brake performance, which could result in death or serious injury. (00284a) Adjust both forks equally. Improper fork adjustment can lead to loss of control, which could result in death or serious injury. (00124c) Compression and rebound adjusting valves may be damaged if too much force is used at either end of the adjustment range. (00237a) NOTES Damping is set at the factory for the average solo rider under normal riding conditions. The rider may make adjustments to compensate for individual riding styles and varying road conditions. Evaluating and changing the rebound and compression damping is a very subjective process with many variables and should be approached carefully. The front and rear preload setting will need to be adjusted for the rider’s weight and cargo. This adjustment should be made before the motorcycle is ridden any distance and after changing the overall vehicle weight (adding saddlebags, etc.). If the preload adjustment is correct, and you have the rebound and compression damping set at the factory recommended points, the motorcycle should handle and ride properly. Changes in the load carried requires changes in the preload setting(s). Carrying less weight than was used for setting up the suspension requires decreasing the amount of preload. Increasing the load carried requires adding more preload. The following tools are needed to make suspension adjust- ments. • 5 mm hex key (front fork preload adjustment tool). • Spanner wrench with extension handle (shock absorber preload adjustment). • Screw driver (front fork damping adjustment). 1. Front fork preload adjustment: a. See Figure 4 and Table 1. Using the 5 mm hex key, turn the preload adjuster counterclockwise until it stops. This is the minimum preload setting. b. Turn the preload adjuster clockwise the recommended amount specified for the rider weight

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ATK 50MX INSTALLATION AND ADJUSTMENT TIPS

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Filed Under (Atk) by admin on 01-11-2010

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PRELOAD ADJUSTMENT— On some Works shocks a threaded preload is standard. This allows the adjustment of the ride height of the motorcycle. The preload is changed by turning a threaded nut down towards the spring (higher ride height) or up away from the spring (lower ride height). The nut is a right-hand thread. CHECKING RIDE HEIGHT— 1. With the bike unloaded on the side stand and the shock fully extended, have an assistant measure from a point at the axle (center point) to a point on the frame, fender or bodywork directly above it. Record this measurement. 2. With the bike off the stand and the rider in the seat, bounce on the suspension and let the bike settle. Have the assistant measure from the same two points. Subtract the second measurement from the first. HM CRX50 / BAJA & ATK 50MX INSTALLATION AND ADJUSTMENT TIPS Continued on next page. #HM50 – 5/27/99 #HM50 – 5/27/99 To Front Valve Mounting channel Spacer Flange Shock eye Top View of Shock Mount Fig. 1 Top view of upper shock mount. The flange on the shock bushing must face toward the spacer. The valve should point toward the front of the bike Fig. 1 Top view of upper shock mount. The flange on the shock bushing must face toward the spacer. The valve should point toward the front of the bike 3. The amount of settle, or “sag” is a function of the wheel travel. It should only be between 1/4 and 1/3 of the total travel. 4. If the difference is less than the minimum, reduce the spring preload. Measure the distance again starting with Step 2. Adjust again if necessary. 5. If the difference is more than the maximum, increase the spring preload. Measure the distance again starting with Step 2. Adjust again if necessary. Note: If the ride height is too low, the shock will bottom unnecessarily, resulting in a harsh ride. If the ride height is too high, the shock will “top out” too easily when rebounding from a bump or under hard deceleration. NITROGEN PRESSURES IN EMULSION SHOCKS CAUTION: The pressure in these shocks cannot successfully be checked. Concerns with the gauge volume and the gas volume in the shock body create a situation where you cannot accurately determine what pressure was in the shock. In addition when the pressure is lowered (i.e. checking the pressure) the gas and some of the shock oil escapes into the gauge. It is possible to lose a large percentage of the shock oil by depressing the core of a charged shock to the atmosphere. Please note that in order to check the pressure, some of the gas must escape and fill the gauge assembly. The volume of the gas pocket is about half the size of your thumb, so a very small volume change results in a large pressure drop. Because the gauges’ volumes vary, it is not possible to deduce the actual pressure in the shock prior to attaching the gauge. Therefore it is imperative that any attempt to check pressure be accompanied by the capability of refilling the shock. In other words: If you don’t have a nitrogen source handy, don’t check the pressure! PRESSURIZING EMULSION SHOCKS The pressure setting for Works gas shocks is 250 p.s.i. of dry nitrogen. To pressurize a shock with some residual pressure in it, bring the gauge manifold up to 250 p.s.i. and depress the core with the T-handle. This will either equalize the pressure or refill the shock without transferring oil from the shock into the gauge assembly. The best gauges for this purpose screw on to the valve and incorporate a T-handled core depressor to isolate the shock from the gauge. This allows a leak-free separation once the desired pressure is reached. For simplified operation, an extra valve is provided for the filling apparatus, allowing pressure adjustment with the gauge in place. Works offers a suitable gauge and filling manifold. Most motorcycle shops that deal with dirt bikes can pressurize the shock

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Dellorto Motorcycle Carburetor Tuning Guide INSTALLATION

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Filed Under (Tips and Review) by admin on 01-02-2012

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The main Carburetor functions are: • To form a proper homogeneous inflammable mixture of fuel and air • To supply the engine with varying amounts of this mixture The fuel-air mixture is formed through vapourising and by uniformly spraying fuel into the airstream or at least by atomising it into very small droplets. Atomization takes place in this way: liquid fuel from the atomiser nozzle meets the flow of air which carries it, broken into very fine droplets, to the combustion chamber. We have spoken of a “proper” mixture because the mixture strength, defined as the amount of air in weight mixed with a fuel unit of weight, must have a precise value, ie it must be within the limits of inflammability so that the mixture can be easily ignited by the spark in the combustion chamber. lnflammmability limits for commercial petrol are: 7: 1 (rich limit ie. 7 kgs of air and 1 kg of petrol) , down to 20: 1 (lean limit ie. 20 kgs of air and 1 kg of petrol) . To obtain optimum combustion between these inflammability limits, a value very close to the so- called stoiciometric value is needed ie. about 14.5 – 15.0 kgs of air to 1 kg of petrol. A stoiciometric mixture ratio is one which ensures complete combustion of fuel with only the formation of water and carbon dioxide. The stoiciometric mixture ratio depends on the kind of fuel used, so if the fuel is changed, this fuel- air ratio will also change (see SECTION 5.1 ) .

Harley-Davidson Evolution Engines, Hydraulic Lifter Limited Travel Kit Installation Manual

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Filed Under (Harley Davidson) by admin on 23-10-2010

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Remove tappet assemblies from engine being sure that each one is kept with it’soriginal tappet block. NOTE: This procedure is the preferred method of installation. However, kit can be installed without removing lifters from engine. 2. Remove hydraulic piston retaining wire clip from one assembly at a time. Be careful not to bend wire clip during disassembly. 3. Completely disassemble tappet removing all parts. 4. Thoroughly clean all parts including tappet body. Remove any oil which might prevent hydraulic unit from fully collapsing during adjustment. 5. Insert one spacer from S&S HL 2 Tkit in tappet body. 6. Reassemble tappet in reverse order making sure original parts arereturned to their original positions. See Picture1. 7. Replace wire retaining clip in tappet body. 8. Put tappet back in original tappet block. 9. Repeat Steps 2 through 8 for three remaining tappets. 10. Reassemble engine with modified tappets. 11. Adjust pushrods. NOTE – In all cases engine must be cold and lifter must be at lowest point of travel for pushrod adjustment To prevent accidents, remove ground cable from battery. A. Remove spark plugs. B. Bring piston to TDC on compression stroke in cylinder to be adjusted. Normally both tappets will be at their lowest point of travel. C. Extend pushrod adjustment, collapsing lifter until piston assembly is in contact with HL 2 Tspacer and pushrod is tight. If tappets contain oil, as when pushrods are readjusted after engine has been run, or if all oil was not removed during installation, extend pushrod adjustment until valve is open (about five additional turns of adjusting screw). Allow 5 minutes for hydraulic unit to bleed down. If pushrod can be turned with fingers after bleeding down, lifter is not completely collapsed, and this step must be repeated. NOTE – perform this operation on one cylinder at a time. Do not turn engine until pushrod adjustment is complete. Turning engine while valve is held off the seat could result in valve to valve or valve to piston contact and serious valve train damage. D. Loosen pushrod adjustment until pushrod can be rotated with the fingers with slight drag. NOTE – Shortening adjuster an additional six flats or full turn from zero lash often results in quieter pushrod operation. This provides additional travel for the hydraulic piston assembly, which can improve the ability of the hydraulic unit to maintain zerolash under normal operating conditions. E. Tighten lock nut. F. Follow the same procedure for all four push rods. G. Recheck pushrod adjustment after a few hundred miles. NOTES ● It is a good idea to recheck pushrod adjustment in a new engine as valve train may tighten up due to gasket compression and valve seat wear. ● Upon initial start up after modification, HL 2 Tequipped lifters may be somewhat noisy for 10-20 miles. If lifters are still noisy after 20 miles it is recommended that pushrods be adjusted 1⁄2 turnlooser. See step D

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2002 GL 1800 Reverse Cable Inspection/ Adjustment PROCEDURE

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Filed Under (Honda) by admin on 29-01-2011

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INSPECTION/ADJUSTMENT PROCEDURE 1. Remove the right engine side cover (see S/M Page 2-4). 2. Check the cable clearance on the N (neutral) and R (reverse) cables. Note: It is not necessary to remove the center inner fairing or inspect the reverse shift actuator. . 6. Push the reverse shift switch to “OFF” and turn off the ignition. 7. Tighten the reverse cable lock nuts. 8. Reinstall the right engine side cover. PARTS INFORMATION No parts are required for this procedure. WARRANTY INFORMATION Normal warranty. After completion of the inspection/adjustment, submit one claim per VIN using the following information only: Template #: GL#5 Flat Rate Time = 0.3 hours The reverse cable lock nuts may not have been properly tightened on some GL1800 units. We have developed a procedure to inspect and adjust any affected units. Please follow the INSPECTION/ ADJUSTMENT procedures included in this Service Bulletin. AFFECTED UNITS 2002 GL1800 units with VIN range: 1HFSC470*2A102303 through 1HFSC470*2A102622 * indicates check digit Any unit in the above VIN range may be affected and should be inspected according to the procedures in this Service Bulletin. All units outside of the above VIN range do not require inspection.

BMW Motorcycles PolyVbelt adjustment – all R1150 engines

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

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the maintenance schedules of the R 1150 GS, R 1150 R, R 1150 RS, R 1150 RTand R 1150 RT-CHP have been revised to include the one-time retensioning of the poly-Vbelt as part of the 6,000 mile service. The modified “retensioning”procedure is described below. Note: The special tensioning nut, BMWspecial tool number12 3 551, is required for this adjustment. This special tool is included in the initial equipment package forthe R 1150 RS. In the case of motorcycles that have alreadycovered 6,000 miles, and on which the poly-Vbelt was not retensioned as part of the 6,000 service, this adjustment must be performed as part of the 12,000 mile, ornext scheduled/annual service PolyVbelt tensioning instructions: 1) Remove front engine cover. 2) Undo nut (2) and screw on tensioning nut, BMWspecial tool 12 3 551. 3) Loosen the alternatormounting bolts (3,4). 4) Using a torque wrench, togetherwith BMWspecial tool 12 3 551, preload the polyVbelt to 8 Nm and hold this adjustment. 5) Tighten the upper retaining nut (4), then remove the torque wrench from the adjusting screw. 6) Tighten all screws and nuts 7) Install front cover. Tightening torque: Poly Vbelt preload: ……………………………….8 Nm Alternatorto the alternatorsupport cover20 Nm

HONDA CR250R Owner’s Manual

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Filed Under (Honda) by admin on 24-04-2011

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l. CONTROLS( 1 ) Frontbralte tever (2) Throttle grip ( 3 ) Engine stop switch When shutting off engine, press in the  engine stop switch button. (4 ) Rear brake pedal ( 5 I Kickstarter pedal ( 6 } Clutch lever (1′) Fuel tank filler cap ( 8) Gear change pedal The transmission has S speeds. Depress the pedal to Shift into [st gear. Raise the pedal to shift into 2nd, 3rd, 4th and 5th. Neutral is located between 1st and 2nd.  9 ) Fuel mixture enrichment l-mob When starting a cold engne, raise the fuel mixture knob and fully depress the kickstarter pedal. (10) Fuel valve When the fuel valve is turned to "OFF", fuel cannot Flow from the fuel tank to the carburetor. When the fuel valve is turned to “ON”, fuel will flow from the tank to the carburetor. (1 1] Rear shock absorber adjuster The rear shock absorber springs have three settings for precise adjustment of the rear suspension to suit riding conditions and differences in rider weight. Page 6 2 l. OPERATING – Fig. l—2 (1) Fuel tank -  2. FUEL The Honda CRZSUR ELSINORE has a two-stroke engine that requires a gasoline-oil mixture. The capacity of the “fuel tank is 8.59 (2.2 US gal. 1.9 Imp. gal). I Any automotive gasoline with :1 pump octane number of 86 or higher. or research octane number of9i or higher‘ may he used. If “l ofgasoline or a higher octane grade. USE HONDA 2-STROKE INJECTOR OIL OR EQUIVALENT. I Premix gasoline and oil in a ratio of   20:1 Prepare the fuel mixture in a clean container, and shake until thoroughly mixed before Flling the fuel tank. i Too much oil will muse excessive smoking and spark plug fouling. Too little oil will cause engine damage or premature wear. Mix fuel in a ratio of 20 parts gasoline to 1 part oil. I Vegetable oils separate from gasoline more easily than mineral oils, especially in cold weather. It is advisable to use mineral oil when ambient temperatures of below 0°C (32°F) are expected. I If the gasoline-oil mixture is left standing in a container for a long period of time, lubricity will deteriorate. Use the mixture within 24 hours. I Once an oil container is opened, the oil must be used within one month, since oxidation may occur. Do not mix vegetable and mineral oils. Gasoline is flammable and explosive under certain conditions. Always stop the engine and do not smoke or allow open flames or sparks near the motorcycle when refueling

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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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