1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 67Get this manual
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FUEL SYSTEM
Pilot screw opening
The carburetor must be adjusted for high altitude riding (between 3,000-8,000 ft1 ,000-2,500 m)STANDARD SETTING: Below 5,000 ft (1,500 m) HIGH