2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 564Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEED
1, Fuel Pump Inspection
Inspect the fuel flow
Is the fuel pump unit operation normal?
NOFaulty fuel pump unit (page 6-36)
- GOTOSTEP2
2PGM-FI System Inspection
Check the PGM-FI system
Is the PGM-FI system normal?
- Faulty PGM-FI system (page 6-13)
- GO TO STEP 3
3Ignition Timing Inspection
Check ignition timing,
Is the ignitiontiming correct?
- Faulty peM
Faulty CKP sensor