2004-2005 Honda TRX450R Factory Sevice Manual, Page 332Get this manual
TROU BLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
1Fuel line In spection
Disconnect th fuel line at the carburetor
Does fue' flow free ly?
YESGO TO STEP2NOClogged fuel line Clogged fue fill cap breather hose Faulty fuel valve Clogged fue st rainer
2Carburetor Inspect io n
Check carburetor fo cl ogg ing Is the CBrburtttor clogg ed ?
- Carburetor not serv iced fr equ entl enoug h
- GO TO STEP 3
3Valve Timing Inspection
Check valve timing
Is th valve timing correct?