1985-1987 Honda TRX 250 Fourtrax 250 Service Manual, Page 233Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEEDS
Probable Cause 1Check ignition timing and
valve clearance
CORRECT
INCORRECT
1) Improper valve clearance
(2) Faulty COl unit
(3) Faulty pulse generator (4) Improper flywheel installation
fuel tube at
FUEL FLOW RESTRICTED
carburetor
FUEL FLOWS FREELY
3Remove carburetor and
check for clogged jet
NOT CLOGGED
(1) lack of fuel in tank (21 Clogged fuel line (3) Clogged fuel tank cap breather hole (4Clogged fuel valve