2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 77Get this manual
FUEL SYSTEM Install the float chamber and carburetorTurn-in the pilot screw the spec ified number of turns from the initial setting
TOOL: Pilot screw wrench
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HIGH ALTITUDE PILOT SCREW OPENING: 1 tum in from initial opening
Start the engine and adjust the idle speed at high altitude to ensure proper high alti tude operation