1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 346Get this manual
ENGINESCARBU RETION Throttle Opening The chart shows the relationship of each carburetor component to fuel flow vsthrottle valve openingThe pilot system's main function is that of low speed jetIts most effective range of fuel delivery is from idle to approximately 38 throttle valve openingThe throttle valve controls the rate of engine air by its movement up and down in the carburetor venturiAt small throttle openings the air flow is chiefly regulated by the valve cutawayIts greatest effectiveness is at 14 throttle openingThrottle valves are numbered 1.0, 1.5, 2.0, etc according to the size of the cutawayDecreasing the cutaway number increases the amount of fuel delivered in the throttle valve's effective rangeThe jet needle and needle jet have an effective operating range from approximately 18 to 78 throttle openingThe amount of fuel delivered in this range depends upon the jet needle clip position, as well as the needle jet size and various other specificationsThe main jet affects fuel delivery at 14 throttle and increases conSistently to full throttle opening