2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 335Get this manual
1 TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
1Fuel Line Inspection Disconnect fuel lin at carburetorDoes fuel flow freely? NO Clogged fuel line Clogged fuel fill cap breather Faulty fuel valve Clogged fue strainer
- GO TO STEP 2
2Carburetor Inspection Check ca rburetor for clogg ing Is the carburetor clogged? YES NO Carburetor not serviced frequently enoughGO TO STEP 3