Preparation:
- Make sure the engine is cold and the fuel valve is turned off.
- Remove the air filter cover.
- Remove the fuel line from the carburetor.
Steps to adjust:
1. Pilot Screw (Air Fuel Mixture Screw):
- Turn the air/fuel mixture pilot screw clockwise until it is fully seated, but do not overtighten.
- Then turn the screw out 2.5 turns counterclockwise (2.5 turns out from fully seated).
2. Idle Screw:
- Turn the idle adjustment screw clockwise until the slide valve (the round part that moves up and down) just covers the small hole on the carburetor throat (where the air filter connects).
- Then, turn the screw counterclockwise 1/8 to 1/4 of a turn to set the idle speed slightly higher than normal.
Final Adjustments:
- Connect the fuel line to the carburetor.
- Turn on the fuel valve.
- Start the engine and let it warm up to its normal operating temperature.
- If the engine stalls or hesitates, adjust the pilot screw by turning it in or out in 1/4 turn increments until the engine runs smoothly.
- If the engine is racing, adjust the idle adjustment screw to lower the idle speed.
Test Ride:
- Take the motorcycle for a test ride to ensure the adjustments are correct.
- If necessary, make fine adjustments to the pilot screw and idle screw until you achieve smooth performance and good throttle response.
Remember, small adjustments can make a significant difference, so adjust the carburetor carefully and do not over-tighten any screws.
