2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 562Get this manual
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TROUBLESHOOTING 8 Cylinder Compression Inspection
Check the PGM-FI system
Is the PGM-FI System normal?
NOFaulty PGM-FI system (page 6-13)
Inspection
YES -GOTOSTEP1