2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 358Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
1Fuel Flow Inspection Disconnect the fuel hose at carburetor and check fuel flowDoes fuel flow freely? NOClogged fuel hose Restricted fuel tank breather hose Faulty fuel valve Clogged fuel strainer
- GO TO STEP 2
2Carburetor Inspection Check the carburetor for clogging Are the carburetor passages clear? NO YESCarburetor not serviced frequently enoughGO TO STEP 3
3Valve Timing Inspection Check the valve timingIs the valve timing correct? NO YESCamshaft not installed properlyGO TO STEP 4
4Ignition Timing Inspection Check the ignition timingIs the ignition timing as specified? NO YESFaulty ignition control module (lCM) Faulty CKP sensorGO TO STEP 5