Honda 2006 TRX680FA Service Manual page 564

TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
1, Fuel Pump Inspection
Inspect the fuel flow.
Is the fuel pump unit operation normal?
NO - Faulty fuel pump unit (page 6-36)
YES - GOTOSTEP2.
2. PGM-FI System Inspection
Check the PGM-FI system.
Is the PGM-FI system normal?
NO - Faulty PGM-FI system (page
6-13)
YES - GO TO STEP 3.
3. Ignition Timing Inspection
Check ignition timing,
Is the ignitiontiming correct?
NO - . Faulty
peM
• Faulty CKP sensor
YES - GO TO STEP 4.
4. Valve Timing Inspection
Check valve timing.
Is the valve timing correct?
NO - Camshaft not installed properly
YES - GOTO STEP 5.
5. Valve Spring Inspection
Check valve springs.
Are the valve springs weak?
YES - . Faulty valve spring
NO _. Faulty AfT system
POOR HANDLING
Steering is heavy
• Steering shaft nut or holder too tight
• Damaged steering shaft bushing
• Damaged steering shaft bearing
Any wheel is wobbling
• Excessive wheel bearing play
• Bent
rim
• Improperly installed wheel hub
• Loose suspension arm
• Bent frame
Vehicle pulls to one side
• Tire air pressure incorrect
• Faulty shock absorber
• Bent tie-rod
• Incorrect tie-rod adjustment
• Bent frame
• Improper wheel alignment
25-6