2003 Polaris Deep Snow Snowmobiles Service Manual, Page 144Get this manual
FUEL SYSTEMCARBURETION
CAUTION: Wear eye protection when using compressed air or cleaning solventsReview all fuel system warnings before proceeding
Carburetor Removal, Disassembly, and Inspection (Typical VM Mikuni)
1Remove carburetor from engineBefore disassembling, clean outside of carburetor thoroughly with solventCAUTION: Do not use compressed air to dry at this timeThe float chamber could become pressurized resulting in damage to the floats or inlet needle and seat Water Trap Idle Speed Screw Choke Passages
Pilot Air Screw
2Remove slide valveInspect for nicks or burrs which may cause sticking3Remove jet needle by compressing return spring toward top cap and removing throttle plate which rests on top of needle "E" clipNote the "E" clip position and inspect needle taper for wearAn indication of wear would be an hourglass shape or polished spots somewhere along the taper