1987 Honda Fourtrax TRX 250X Service Manual, Page 227Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEEDS
Probable Cause
1Check ignition timing and valve
INCORRECT-
Improper valve clearance
clearanceCORRECT
Faulty COl unit
Faulty pulse generator
2Disconnect fuel tube at carburetorFUEL FLOWS FREELY
3Remove carburetor and check for clogged jet
FUEL FLOW AE$TRICTEO-Lack of fuel in tank Clogged fuel line Clogged fuel tank breather tube Clogged fuel valve Clogged fuel strainer
NO) CLOGGED