2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 318Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
Possible Cause
1Disconnect fuel tube at carburetor Fuel flow restricted
Resuicted fuel tube
Restricted fuel tank breather tube Faulty fuel valve Clogged fuel strainer
Fuel flows freely
2Cneck carburetor for cloggingClogged-Carburelor nOI serviced frequently enough
Not clogged
3Check valve timing Incorrect-_ Camshaft nol inst&lIed properly
I Correct