xr100 1991 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

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

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

1991 MAINTENANCE SCHEDULE FOR MR2, PREVIA & LAND CRUISER

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Filed Under (Toyota Manuals) by admin on 27-10-2011

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For 1991 models, the Toyota owner’s manual offers 3 maintenance sections within the maintenance chapter following the introduction page as follows: (1) GENERAL MAINTENANCE This section describes maintenance items which are the owner’s responsibility. (2) SCHEDULE A This schedule is for those Toyota vehicles which may require more frequent maintenance, due to driving conditions, environment, etc. This was formerly known as the “Severe” schedule. (3) SCHEDULE B This schedule is Toyota’s minimum maintenance requirement. Items on this schedule must be performed to maintain Toyota’s warranty coverage. This was formerly known as the “Normal” schedule. The highlights of required service are as follows: – Every 7,500 or 12 months / oil and filter change – Every 15,000 or 24 months / chassis components service – Every 30,000 or 36 months / engine and chassis service A summary of the 1991 maintenance schedule “B” chart for three 1991 Toyota models is provided on page 3 of this bulletin for your convenience and quick referenc

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