Performance Starts Here RACING CARBURETORS

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

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Mikuni RS Series Radial Flat Slide carburetors represent the first ever aftermarket true high performance carbs offered to the racing public. Designated the RS for radial slide design, these carbs feature such innovations as: large 34, 36 or 38mm smoothbores, excellent throttle response and streetability, adjustable accelerator pump system, lighter more compact design, quick change needle clip, cam-lock carb synchronizing, horsepower improvement of 25% to 30% and competition priced. • Starter System: Provides fuel enrichment for cold engine starting. • Accelerator Pump Adjust Screws: Sets on and off operation of accelerator pump in relation to throttle slide position. • Adjustable Accelerator Pump: Squirts fuel into carburetor venturi when throttle is opened to improve engine response. • Idle Adjustment Screw: Controls engine idle speed. • Throttle Return Spring: A choice of positioning pegs allows adjustment of spring tension. • Genuine Mikuni Jets: Provide for precise fuel metering. • Pilot Air Jet: in conjunction with the Pilot Fuel Screw for tuning of mixture at idle to 1/4 throttle. • Float Bowl Vent: Allows atmospheric pressure into float bowl for fuel flow. • Smooth Throttle Bore/Venturi: Produces the optimum air and fuel mixture flow at all RPMs. • Jet Needle Clip: Has easy adjustment feature for quick tuning. • Accelerator Pump Spray Nozzle: Shoots fuel directly into the intake tract for immediate engine response. • Flat Throttle Valve Design: Provides the strongest signal for precise and instantaneous throttle response

Mikuni HSR 42/ 45 Installation Instructions

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

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To install, remove the stock carb per Yamaha shop manual procedures. Remove stock throttle cables. Install Mikuni HSR carb into intake manifold and tighten manifold clamp. Install new HSR series throttle cables and adjust cable slack per Yamaha shop manual procedures. Hook fuel line to HSR carb and fasten clamp.* Start motorcycle and fine tune HSR carb for proper running per supplied Mikuni tuning manual. *NOTE: Mikuni HSR series carburetors are designed for gravity-feed fuel systems. You should bypass your stock fuel pump and directly feed your HSR carb right from the fuel petcock. We have noted, though, that you may not be able to get good fuel flow from your Road Star fuel tank in low-fuel situations. You may run your stock fuel pump with the HSR carb, but to do so requires the purchase and installation of an adjustable fuel pressure regulator (set at ½ to 1 lb. of pressure). These are available from most auto parts stores. The stock carb has 2 wires running to the lower rear of the float bowl , these were for a carb warmer, they are not used in this application. Unplug these wires at the main wire harness and retain with your stock carb. The Road Star ignition system uses data from the stock throttle position sensor (TPS) to manage your ignition timing. It is necessary to give the bike this information. You may do so by removing the TPS sensor from the stock carb, leaving it plugged into the main wire harness (the sensor must be fixed to a closed-throttle position), or you may locate the plug for the TPS on the main wire harness and test the leads – you will find one ground, one with .5V and one with 1.5V. Connect the 1.5V to the ground and this will give the bike the same information as stock fully closed throttle.

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HW Prowler Carburetor Installation Instructions

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

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1. Remove both seats and the plastic seat pans under the seats. 2. Remove the engine cover 3. Remove the air-box by removing the cross-bar support that runs under the air-box to the framing on each side by the seat framing and disconnect the air box from the carburetor and from the plastic intake in the rear. 4. Disconnect the engine breather hose from the bottom of the air box 5. Set the air-box to the side 6. Disconnect the plug going to the stock carburetor, this is the electronic choke. Wrap the end left on the vehicle with electrical tape. 7. Cut the fuel line just above the fitting on the passenger side of the carb 8. Remove the side cover off the drivers side of the carb where the throttle cable goes in, see fig. #1 9. Pull the throttle cable out and then remove the throttle cable end from the throttle plate See Fig. #2 10. Loosen the clamp on the rear of the carb holding the carb on 11. Pull the carb out of the intake boot 12. Set OE carb to the side. 13. Push the new Carb into the intake boot making sure the carb is perfectly vertical and then tighten the clamp back up. The new carb is slightly larger than the stock one so some additional pressure will be needed to get it in. 14. Route all the breather lines connected to the carb down under the carb. 15. Connect the throttle cable onto the new carb but putting the cable end in the bottom hole of the throttle plate on the passenger side of the carb allowing the cable to ride in the slot in the plate and then turn the throttle plate clock wise allowing the threaded end of the cable to fit into the lower round hole of the throttle cable connection plate. See Fig. #3 16. Make sure you have a nut on each side of the plate turn the nut on the outside of the plate to take up the slack in the throttle cable then tighten the nut on the inside of the plate. See Fig. #3 17. Push the fuel line onto the fuel inlet on the passenger side of the carb and install the supplied clamp to hold it on. The fuel line will be a little hard to push on. 18. DO NOT ATTEMPT TO INSTALL THE CHOKE CABLE PARTS SUPPLIED IN THE KIT UNTIL AFTER THE CHOKE CABLE ITSELF IS INSTALLED AND READY TO SCREW INTO THE CARBUETOR. 19. To install the supplied choke cable, drill a 3/8″ hole in the dash on the left side of the steering wheel in a location convenient to your left hand. 20. Remove the plastic nut from the bottom of the choke handle on the choke cable. 21. Push the choke cable thru the hole you drilled and then slide the nut over the cable to the inside of the dash and reinstall back on the back of the choke mechanism. Some dash screws maybe needed to be removed to accomplish this

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42MM MIKUNI FLATSLIDE CARBURETOR INSTRUCTIONS

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

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To install, remove the stock carb per Yamaha shop manual procedures. Remove stock throttle cables. Install Mikuni HSR carb into intake manifold and tighten manifold clamp. Install new HSR series throttle cables and adjust cable slack per Yamaha shop manual procedures. Hook fuel line to HSR carb and fasten clamp.* Start motorcycle and fine tune HSR carb for proper running per supplied Mikuni tuning manual. *NOTE: Mikuni HSR series carburetors are designed for gravity-feed fuel systems. You should bypass your stock fuel pump and directly feed your HSR carb right from the fuel petcock. We have noted, though, that you may not be able to get good fuel flow from your Road Star fuel tank in low-fuel situations. You may run your stock fuel pump with the HSR carb, but to do so requires the purchase and installation of an adjustable fuel pressure regulator (set at 1/2 to 1 lb. of pressure). These are available from most auto parts stores. The stock carb has 2 wires running to the lower rear of the float bowl , these were for a carb warmer, they are not used in this application. Unplug these wires at the main wire harness and retain with your stock carb. The Road Star ignition system uses data from the stock throttle position sensor (TPS) to manage your ignition timing. It is necessary to give the bike this information. You may do so by removing the TPS sensor from the stock carb, leaving it plugged into the main wire harness (the sensor must be fixed to a closed-throttle position), or you may locate the plug for the TPS on the main wire harness and test the leads – you will find one ground, one with .5V and one with 1.5V. Connect the 1.5V to the ground and this will give the bike the same information as stock fully closed throttle. The output of the OEM fuel pump is too high and will cause fuel overflow in the HSR carb, resulting in a possible dangerous fire hazard

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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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Mikuni VM 36 mm Round Slide Carburetor Instalation

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

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Carbs fit perfectly in the stock carb mounting boots for 1980 and up XS 650s that came with the chrome *bit of tin” vacuum chamber tops. Air filters extend to stock battery box.The custom 2 into 1 throttle cable comes made to fit with the stock Yamaha throttle housing! This bike idles crisp and clean, has instant throttle response and pulls hard from idle to redline, no bog, or loading up, even with the bone stock exhaust system. Very impressive performance over the stock worn out 34mm CV carbs

Mikuni Carburetor Rebuild

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

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1.1 (Below) First note the position of both your high and low speed screws (some models also have a midrange screw). Use a screwdriver to lightly set the screw, noting how many turns in it takes. NOTE: Some Sea-Doos may be seated fully (zero turns) to begin with; do not force the screws. After noting the screw positions, remove the screws. 1.2 Remove the center screw, fuel inlet and o-ring. 1.3 (Below) Remove the six screws securing the pump cover and remove it. 1.4 (Below) Remove the check valve diaphragm. 1.5 (Below) Remove the pump body. 1.6 (Below) Remove the regulator cover and clean the gasket off from it.

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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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