1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 347Get this manual
ENGINESCARBURETION Pilot Jet From idling to low speeds the fuel supply is measured mainly by the pilot jetThere are several air bleed openings in the sides of the pilot jet which serve the same purpose as the air bleed in the needle jet, reducing the fuel to mistThe number stamped on the jet is an indication of the cc's of fuel which pass through the jet during one minute interval, under given set of conditions
Indicator Number
Pilot Air Screw The air screw controls the fuel mixture from idling to low speedsThe tapered tip of the air screw projects into the air passage leading to the pilot jet air bleeds8y turning the screw in or out, the area of the air passage is varied, which in turn varies the pilot jet air supply and changes the mixture ratio