Idle Speed Screw
- Turn the idle speed screw clockwise until the engine starts to idle too fast, then turn it counterclockwise until the engine idles smoothly at around 1,500 RPM.
Air Screw
- Turn the air screw clockwise until the engine starts to run rough, then turn it counterclockwise until the engine runs smoothly.
Fuel Screw
- Turn the fuel screw clockwise until the engine starts to run rich (bogs down when you accelerate), then turn it counterclockwise until the engine runs smoothly.
Once you have made these adjustments, you should test ride the ATV to make sure that it is running properly. If it is not, you may need to make further adjustments.