Poor Performance At High Speed; Poor Handling - Honda TRX450R Service Manual

TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
1. Fuel Line Inspection
Disconnect the fuel line at the carburetor.
Does fuel flow freely?
YES - GO TO STEP 2.
NO - • Clogged fuel line
• Clogged fuel fill cap breather hose
• Faulty fuel valve
• Clogged fuel strainer
2. Carburetor Inspection
Check carburetor for clogging.
Is the carburetor clogged?
YES - Carburetor not serviced frequently enough
NO - GO TO STEP 3.
3. Valve Timing Inspection
Check valve timing.
Is the valve timing correct?
NO - Camshaft not installed properly
YES - GO TO STEP 4.
4. Ignition Tinning Inspection
Check ignition timing.
Is the ignition timing correct?
NO - • Faulty ignition control module (ICM)
• Faulty ignition pulse generator
YES - GO TO STEP 5.
5. Valve Spring Inspection
Check valve springs.
Are the valve springs weak?
YES - Faulty valve springs
POOR HANDLING
Steering is heavy
Steering shaft holder bolts too tight
Damaged steering shaft bushing
Damaged steering shaft bearing
Any wheel is wobbling
Excessive wheel bearing play
Bent rim
Improperly installed wheel hub
Excessively worn swingarm pivot bearings
Bent frame
Vehicle pulls to one side
Tire air pressure incorrect
Faulty shock absorber
Bent tie-rod
Incorrect tie-rod adjustment
Bent swingarm
Bent frame
Improper wheel alignment
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