2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 113Get this manual
FUEL SYSTEM Start the engine and warm it upAdjust the idle speed at high altitude with the throttle stop screw to ensure proper high altitude operationIDLE SPEED: 1,400 100 rpm (mirr1)
When the carburetor has been modified for high altitude operation, the air-fuel mixture will be too lean for low altitude useOperation at altitudes below 5,000 feet (1,500 m) with modified carburetor may cause the engine overheat, resulting in serious engine damage and increased exhaust emissionsFor use at low altitudes, you should return the carburetor to original factory specificationsReplace the main jet with the standard main jet, and screw out the pilot screw the specified number of turns from the high altitude settingSTANDARD MAIN JET: #162 LOW ALTITUDE PILOT SCREW OPENING: 38 turn out from the high altitude setting TOOL: Pilot screw wrench, type 07KMA-MN90101 or 07KMA-MN9A100 (U.S.Aonly)