2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 130Get this manual
CARBURATION AND FUEL SYSTEM 2Illustration 2: With the carburetor still resting on the level surface, use one hand to slightly tilt the carburetor backThe float will then 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 surfaceIllustration 3: NOTE: If the float is past parallel with the mating surface, the carburetor has been tilted back too far and the float tongue is likely compressing the needle valve pin
Needle and Seat Leakage Test
1Install the float bowlInvert the carburetor and install MityVacTM (PN 2870975) to the fuel inlet fittingApply PSI pressure to inlet fittingThe needle and seat should hold pressure indefinitelyIf not, inspect needle and seat and seat Oring
Float parallel with float bowl mating surface 3Measure the height from the float bowl mating surface to the top of step of the float as shown in Illustration 2Both sides of float should be parallel to each otherThe measurement should be made at the midpoint on 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 compressedFloat Bowl Height: 13-14 mm 4If adjustment is necessary, bend the tongue slightlyBe sure float measurement is even on left and right side