1987 Honda Fourtrax TRX 250X Service Manual, Page 53Get this manual
FUEL SYSTEM
HIGH ALTITUDE ADJUSTMENT
SPECIFICATIONS
The standard jotting can be used up to 5,000 ft (1,500 ml and the high altitude jetting can be used down to 3,000 ft 1,000 mi It is not recommended to exceed these limitsSee CAUTION belowThe carburetor must be adjusted for high altitude riding (Be
Below 5,000 feet {l ,500 ml Main jet Pilol screw opening #125 Factory preset