Before adjusting, make sure you have a clean air filter, fresh fuel, a new spark plug, and no intake air leaks. Adjust only when the engine is at normal operating temperature.

Gently turn the screw clockwise until it is lightly seated . Do not over-tighten, as you can damage the needle tip. Back it out 1.5 to 2.0 turns .

Start the engine and test the ATV: