2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 93Get this manual
FUElSVSTEM Check that the O-ring on the drain plug is in good condition and replat::a it with II new one if neeessaryTurn in the pilot screw the specified number of turns from the initial setlingHIGH AlTllUDE PILOT SCREW OPENING: 18 turn in from initial opening Start the engine and adjust the idle speed at high altitude to ensure proper high altitude operationSustained operation below 5,000 ft 11,500 ml with the high altitude settings may cause engine over heating and engine damageInstall the standard main jet and screw out the pilot screw the specified number of turns, when rid ing below 5,000 ft (, ,500