ss carburetors float adjustment

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Triumph Bonneville Tuning Manual

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Filed Under (Triumph) by admin on 20-11-2010

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1. The Float The float bowl acts as a fuel reservoir to meet engine demand. The float is hinged on a pin in the float boss. It rises and falls with the fuel level in the float bowl. The small metal tang integrated in the plastic float supports the float valve, also known as the float needle. As the fuel in the float bowl rises, the float valve is pushed into the valve seat, until it’s high enough to shut off the fuel flow to the bowl. As fuel is used the level in the bowl drops lowering the float which pulls the float valve from its seat, and fills again. Adjusting the height of the float has a big effect on the mixture as a low or high float level makes it harder or easier for the vacuum to suck fuel into the venturi. Differing float levels cause an imbalance which may be perceived as vibration. 2. The Choke This system is referred to as the choke. But that’s a misnomer. When you pull the choke knob, what you’re doing is retracting a plunger that opens a tube connected to the starter jet, allowing additional fuel to enter the venturi just below the vacuum hose nipple. It supplements the pilot system at start up. 3. The Pilot System The primary purpose of the pilot system is to supply the mixture at idle. It continues to supply fuel throughout the entire throttle range, but after about 1/8 throttle is reached the main system starts to put out more of the total mixture, up to full throttle. By adjusting the idle with the big screw on the left side of the carburettors the position of the butterfly is altered, so exposing one or more of the four small holes that are drilled into the venturi, (leading to the pilot jet) just under the butterfly valve, letting more or less air pass the butterfly. Adjusting the pilot screw that’s under the carburettor varies the amount of air premixing with the fuel before it enters the venturi. 4. The Main System Open the throttle and the cable that’s connected to the butterfly valve turns it from vertical to horizontal, so letting more air through the venturi. This increases the vacuum effect that is transferred up through the vacuum drilling in the slide to the diaphragm valve that leads to the diaphragm chamber. The top chamber is separated from the bottom by a rubber diaphragm. The bottom chamber is open to atmospheric pressure from the airbox. When the vacuum in the top chamber rises enough, the constant ambient pressure of the lower chamber helps the diaphragm valve overcome the downward force of the diaphragm spring, so it rises from the ven- turi. As the diaphragm is raised the needle is pulled out of the needle jet, exposing a thinner portion of the needle taper which allows more fuel to rise into the venturi to meet the increased engine demand. The key parts of the main system are shown in the photo below

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

Ural carburetors Installation and idle adjustment

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Filed Under (Ural) by admin on 02-11-2010

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1. First you must adjust the idle. It is acceptable per the manual to adjust the idle by using the idle adjust screws (11). This usually involves screwing them then backing out 1 to 1.5 turns. Or you can adjust looking at the sliders 2. If installing the carburetors: a. Remove the cover (2) b. Reomve the slider (3) c. Place the throttle cable through the guide (18) with the spring (4) on the cable. d. Route the cable through the slide catch (6) e. Insert the slide assembly into the chamber and make sure it easily slides up and down. Direct the needle (8) into the opening of the diffuser (angled side visible). f. Screw assembly together and verify via throttle movement that slide moves freely. Attach fuel delivery lines to (12). 3. Using the idle set screw (11) raise the slider so the lower edge is 1-2 mm. 4. Assemble to engine using the proper gaskets (paper – felt – paper). 5. Using the locknut (26) adjust the free play of the throttle cable (2-3 mm) 6. Adjust the idle mixture screw – turn in completely then out 1 to 1.5 turns 1. Remove one of the spark plug caps, and with the cap shorted, adjust (11) to decrease RPM’s to a point of being minimally steady. 2. Adjust the mixture (15) out until RPM’s decrease. Turn in until RPM’s increase slightly. Then turn in screws ¼ to 1/3 revoultion. 3. Do the same for the second carburetor with the first spark plug cap shorted. 4. With both cylinders, adjust each idle (11) on each carburetor the same amount each until it’s at a steady, minimal RPM. Use small changes. (at this point you can use your airflow tool to check). 5. Sharply increase, then decrease throttle. Then engine must return to low RPMs smoothly. If the engine goes below limits, readjust (11) from step 4. Synchronization of the K68 Note: Rather than using the opposite cylinder shorted to test the pull of the live cylinder carburetor, you can use something like a Twinmax connected to the test ports (27 Fig 1). Or, if you have a model without these ports, use a Synchrometer (Appendix 2) held against the face of the carburetor. These tools merely show airflow passing through each carburetor (which is dependent on the position and wear on the slide). If using these tools, it’s not necessary to do the following steps. You wil want to use a throttle guide (Appendix 1), to show airflow at various throttle settings. Using the flow meter of your choice make sure each carburetor is the same at the various throttle settings. 1. Place the motorcycle on the center stand ensuring the rear wheel is suspended 2. Make sure you have large area to work with (safety issues here) 3. Shift into the highest gear with the engine running 4. Short one spark plug cap to the cylinder (using a nail or something in the fins) 5. Increase the speed to 40-50 km/hr 6. Fix the throttle using the throttle (maybe using a throttle stop screw under the throttle housing). 7. Reconnect other cylinder and using the opposite carburetor determine the speed which should be the same as the first. 8. Adjust the position of this slide to achieve the referenced speed using the locknut at the top of the carburetor.

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

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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