2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 165Get this manual
FUEL SYSTEMCARBURETION
FLOAT HEIGHT ADJUSTMENT
1Place the carburetor on level surface as shown at right to remove weight from float armIn this position, the float tongue will rest lightly on the inlet needle valve pin without compressing the spring2Measure the height from the float bowl mating surface to the top of step in float as shownBoth sides of float should be parallel to each otherThe measurement should be made at the mid-point on the top of the float using float adjustment tool (PN 2872314) or vernier caliperWhen measuring the height be sure the inlet needle valve spring is not compressed