2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 164Get this manual
FUEL SYSTEM (After '05) Screw the pilot screw in the specified number of turns from the factory preset position using the special toolHIGH ALTITUDE PILOT SCREW OPENING: 14 turn in from the factory preset position TOOL: Pilot screw wrench 07KMA-MN90101
PILOT SCREW
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: 1,700 100 rpm
THROTTLE STOP SCREW