2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 302Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
Possible caus e
1Disconnect fuel tube at carburetor- Fuel flow restricted
Fuel flows freely
Clogged fuel line Clogged fuel fi cap breather Faulty fuel valve Clogged fuel strainer
2Check carburetor for clogging- Clogged- Carburet or not serviced frequently enough
Not clogged
3Check valve timingIncorrect Camshaft not installed properly
Correct
4Check ignition timingIncorrect
Faulty ignition control module (leM) Faulty ignition pulse generator