1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 67Get this manual
FUEL SYSTEM
HIGH ALTITUDE ADJUSTMENT
SPECIFICATIONS
Below Between
(1) MAIN JET
5,000 ft (1,500 m)
Main jet
3,000-8,000 ft (1,000-2,500 m) #115 #120
'88-'9012 turn in '91: 34 turn in '92: 112 turn in After '92: 34 turn in
After '90
Factory preset
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 ALTITUDE SETTING: Between 3,000-8,000 ft