2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 518Get this manual
IGNITION SYSTEM
TROUBLESHOOTING
Inspect the following before diagnosing the system:Faulty spark plugLoose spark plug cap or spark plug wire connection
- Water got into the spark plug cap (leaking the ignition coil secondary voltage)
No spark at spark plug
UNUSUAL CONDITION
Ignition coil primary
Low peak vctteqe
voltage
No peak voltage