mikuni 38mm air screw adjustment

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How To Adjust the Accelerator Pump On the 40mm Mikuni Carburetor

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Filed Under (Yamaha) by admin on 21-01-2012

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1) The “blue” colored screw in the image is the duration adjustment screw. Underneath the head of the screw is a lock nut and the bracket arm that the screw is threaded into. To decrease the amount of fuel squirted the adjustment screw is turned “clockwise” or in. To increase the amount of fuel squirted the adjustment screw is turned “counter clockwise” or out. To get the max, amount of decrease remove the screw and take the lock nut off of the screw. Then replace the screw into the cam arm, then replace the lock nut underneath the arm on the screw. this gives you another 3/32″ of an inch in which the screw can be screwed in.
2) Turn the adjustment screw fully clockwise or IN. Start your engine, Blip your throttle open, if the engine stutters, (hesitates), it is not getting enough fuel so turn the screw counter clockwise to increase the amount of fuel squirted from the accelerator pump into the carburetor. Keep blipping the throttle and adjusting the screw till the carburetor starts to cough. Stop here and turn the screw back in till the coughing stops. Tighten down the lock nut. This should give you the best throttle response with the least amount of coughing and backfiring out the carburetor. Timing Adjustment Screw This is the “Green” colored screw just above the Blue duration adjustment screw. The” Mucker” said it best,,,,, This upper screw adjusts the “timing” of the squirt. By altering it’s setting, you can advance or delay the onset of the fuel squirt. But probably, it won’t have to be touched

Victory Freedom Engines Installation Instructions for S&S Air Cleaner Kit

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

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1-Locate and remove the Intake Air Temperature Sensor (IATS) from the stock Polaris Victory air box. Locate the new position for the IATS on the bottom of the S&S air cleaner. Push the IATS in the lower air cleaner cover and turn1⁄ 4 turnin either direction, make sure you feel it lock into place. Inspect from the inside of the air cleaner to ensure that the barbs are locked into place. See Picture 1. 2-Using the stock Polaris Victory air box gasket (PN 5811908) and S&S supplied (Qty 4) M6 fasteners, assemble the lower air cleaner cover to the throttle body using 243 Blue Loctite®on the treads. Torque the M6 fasteners to 72-96 inch pounds. 3-Position the S&S pre-formed air filter onto the lower air cleaner cover ensuring that it fits into the machined groove. 4-Install the top air cleaner cover on top of the filter ensuring that it fits into the machined groove. 5-Make surethat the filter is situated in the machined grooves on both the top and bottom air cleaner covers. 6-Using 243 Blue Loctite on the threads of the S&S supplied (Qty 3) M6 fasteners tighten down top air cleaner cover evenly until seated. Finish torque the fasteners to 72-96 inch pounds. Now you’re ready for breather hose and barometric pressure hose routing. 7-Locate the S&S supplied 3⁄ 16 “reinforced hose and clamps. Push one end of the hose on the 3⁄ 16 “brass barb in the bottom air cleaner cover and slide clamp up around the end of the hose. The other end of the hose is for the Barometric Pressure Sensor (MAP). Route the hose towardthe back of the engine over the top of the rear rocker cover. 8-Remove the MAP sensor from the stock Polaris Victory air box. Remove the orange rubber gasket from the MAP sensor. Slide the S&S supplied clamp over the 3⁄ 16 “rubber hose that leads to the air cleaner. Push the barbed end of the MAP sensor into the 3⁄ 16 ” rubber hose and slide clamp up to the end of the hose around the barb. A small amount of lubricant may be applied to the barb on the MAP sensor to make installation easier. 2 S&S Air Cleaner Assembly 41-0021 (Calibration cardnot shown) Picture 1 CAUTION WARNING WARNING Plastic barb locked in recess.
9-Assemble and install breather hose as follows: A-Cut the stock Victory®hose on the straight section just behind the 90 degree bend as shown in Picture 2 . B-Slide an S&S supplied 1⁄ 2 “hose clamp over the modified stock breather hose. C-Install the S&S straight barb in Victory breather hose and position a hose clamp around hose end. D-Slide the 90-degree end of breather hose over the brass barb on the air cleaner cover and slide hose clamp in place. E-Position straight end of the S&S breather hose over the 1⁄ 2 “barb to connect to the Victory hose. Slide clamp over connection. F- See Pictures 3 and 4 for breather hose and barometric pressuresensor hose installation positions. NOTE: S&S breather hose can be cut for best fit

Air Shock Installation Instructions

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Filed Under (Tips and Review) by admin on 24-11-2010

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Air HoseInstallation. Choose the most convenient loca- tiononyour motorcycle for the air fill valve. Drilla 5/16″hole and install the air fill valve as shown in Figure 3orsecure air fill valve to frame tube. 2. Keep hose ends clean during installation because dirt can cause air leaks. 3. Install hose connector, tube clamp and two O-rings onto one end of the air hose (See Figures4&5) Apply rubber lubricant (soap solution, not oil) to the O-rings to ease installation on the air hose& into the shock absorber inlet. Plastic connector should just bottom on fitting. Do not overtighten! The function of the nut is to hold everything together in place, the O- rings do the sealing. Fin- gertightenonly (10 in/lb maximum). 4. After routing the air hose, trim the length to fit air fill valve. Install hose connector, tube clamp, and twoO-rings onto end of hose (See figures 4&5). Lubricate as above and assemble to air fill valve. Use the same procedure formating hose. Important —leaveasmall amount of slack in hose near shock absorber to allow for the slight move- mentofthe shock. Caution! Do not install hose near ex- haustsystem, battery or any other sharp edges or seat movement. Keep hoses clear of moving parts such as wheels or suspension components. Do not allow hoses to have excess slack and sag below the motorcycle. The hoses could catch on road surfaces or debris and could be damaged while the motorcycle is in motion. 5. If necessary the air hose can be secured along the motorcycle’swiringharness with tie-wraps. 6. Testing: Inflate system to 50 psi. Apply soapy water solution to all connections and check for air leaks. If there are any leaks, disconnect the suspected fitting and check for dirt or damage to the air line or the O-rings. Remove any dirt or foreign matter, re-lubricate the O-rings and reinstall. If unable to locate the leak, remove rubber boot from shocks and submerge pressurized components under water (in- cludingT-Valve) and check for leaks. If you cannot solve the air leak problem, please contact our technical staff for assistance

2009 Kawasaki ULTRA 250X/ 260X FUEL INJECTION CONTROLLERS And REGULATORS INSTALLATION MANUAL

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Filed Under (Kawasaki) by admin on 25-10-2010

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The R&D high performance Air Filter Kit will improve acceleration and top speed performance by increasing air flow and reducing air temperatures that enter directly into the Ultra 250X’s air plenum box area. The O.E.M. air plenum box on the Ultra 250X is a great design that will flow plenty of air. However, the air that feeds the plenum box is heated by the engine. R&D has created an easy to install “flat filter” that installs directly in place of the large center access inspection cover located directly under the main glove box. The R&D Flat Air Filter insert will allow unrestricted fresh and cool air to enter the air plenum box area which will add power you can feel and a nice high performance tone. The R&D Performance Filter Kit also features two filters, one for each of the surge and blowoff protections valves. The O.E.M. surge valve recycles compressed hot air back into the air box plenum at idle and under deceleration conditions. The R&D surge and blowoff valve filter kit removes the air recycling hoses which will keep the hot air from entering the air plenum box reducing the engines intake air temperatures. The R&D Ultra 250X Air Filter Kit offers great performance tips on how to remove the restrictive air vent hoses which will further reduce the under seat ambient air temperatures. The R&D Filter system does not remove or alter the O.E.M. plenum box in any way, therefore there are no questions to be answered regarding water ingestion

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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