2008 Polaris ATV Predator 50, Sportsman Outlaw 90 Service Manual, Page 102Get this manual
FUEL SYSTEM Float Height Adjustment
1Place the carburetor at level position to remove weight from float armIn this position, the float tongue will rest slightly outwardWith the carburetor at rest and level, slightly tilt the carburetor backThe float should fall into the correct position, with the float tongue resting lightly on the inlet needle valve pin without compressing the springThe bottom of the float should be parallel with the float bowl mating surface
Carburetor Assembly
12Replace parts in proper orderRefer to the parts exploded view or "Disassembly" steps for further detail Install the pilot air mixture screw, spring, washer, and Oring as an assembly (Mikuni Only)Lubricate the O-Ring with oil or light grease before installationTurn the screw in until it lightly contacts the seatBack out the specified number of turnsIMPORTANT: When measuring the height, verify the inlet needle valve spring is not compressedFloat tongue is resting on the spring seat