2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 563Get this manual
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TROUBLESHOOTING
Check the PGM-FI system
Is the PGM-FI system normal?
NOFaulty PGM-FI system (page 6-13)
YESGO TO STEP4
4 Intake Air leak Inspection
Check for