2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 27Get this manual
MAINTENANCE
THROTTLE OPERATIONALL MODELS
Check for smooth throttle opening and closing in all handlebar positionsThrottle lever operation should be smooth and lever must return freely without bindingPlace the gear selector in neutralSet parking brakeStart the engine and let it idleTurn handlebars from full right to full leftIf idle speed increases at any point in the turning range, inspect throttle cable routing and conditionIf cable is routed properly and in good condition, repeat adjustment procedure5Replace the throttle cable if worn, kinked, or damaged1234
PILOT SCREW (IDLE MIXTURE) ADJUSTMENT
NOTE: These procedures are intended as reference onlyActual final settings may be different depending on the atmospheric conditions in your area1Turn pilot screw in (clockwise) until lightly seatedTurn screw out the specified number of turnsNOTE: Do not tighten the pilot screw forcefully against the seat or the screw andor seat will be permanently damaged
CHOKE (ENRICHER) ADJUSTMENT