Setting Up

• 1). Close the fuel petcock valve and remove the rider's seat from the motorcycle.
  
  
• 2). Detach the air cleaners from both carburetors and discard the filter cartridges. Disconnect the fuel lines and throttle linkages from both carburetors. Remove both carburetors and place them on a workbench.
  
  
• 3). Remove the fuel bowls from both carburetors. Empty any residual fuel in the bowls into a gasoline can. Discard the fuel bowl gaskets. Place each bowl upright on the bench with the floats and needle jets intact.
  
  

Rich and Lean Adjustments

• 1). Turn the carburetors over. Note the size of the main jets stamped on the face of each jet. If the bike runs stronger when cold and weaker when warmed up, the main jet is too large. If the bike runs poorly when cold and slightly better when warmed up, the main jet is too small. Replace the main jets as needed.
  
  
• 2). Turn both carburetors over and remove the carburetor caps, diaphragm and throttle return spring from each. Note the position of the jet needle clips inside both carburetors. If the engine is strong in the mid-to-high range (5000 rpm to 7500 rpm) when cold, but poor when warmed up, the carburetors are too rich and the needle clips must be lowered. If performance is substandard at mid-range, the carburetors are too lean and the needle clips must be raised.
  
  
• 3). Lower or raise the needle clip one notch on each carburetors as needed to account for rich or lean operation. Put the new throttle return springs from the Mikuni carburetor kits in each carburetors. Install the new diaphragms and cap gaskets on each carburetor. Reattach the caps on each carburetor.
  
  
• 4). Hold the fuel bowls level and measure the float height from the lip of the bowl on each carburetor using your metric float gauge. Lower the float height 1-mm if you installed a larger main jet. Raise the float height 1-mm if you installed a smaller main jet.
  
  
• 5). Include the new float bowl gaskets from the kits and reattach the float bowls to each carburetor.
  
  

Synchronizing the Carbs

• 1). Mount the carburetors on the engine. Connect the throttle linkages and both fuel lines. Put new filter cartridges in each air cleaner and reattach the air cleaners at both carburetors.
  
  
• 2). Open the fuel petcock valve. Start the motorcycle and allow the engine to warm up to normal operating temperature.
  
  
• 3). Take a position that allows you to operate the throttle twist-grip and observe the throttle linkages on both carburetors. Twist the throttle several times and allow the engine to idle. Observe the tachometer as you adjust the throttle-stop screws on each carburetor so both throttle levers are synchronized and the engine idles at 950 RPM.
  
  
• 4). Allow the engine to idle. Turn the fuel-air mixture screw on one carburetor each way until you find the point where the engine idles at the fastest speed. Repeat the procedure to adjust the fuel-air mixture on the opposite carburetor.
  
  
• 5). Observe the tachometer. Readjust the idle to 950 RPM by turning the throttle cable adjuster either way as needed. Reattach the rider's seat on the motorcycle.