2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 207Get this manual

2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 207

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CYLINDER HEADIVALVECAMSHAFT
- Broken valve spring
- Uneven valve seatingValve stuck open Cylinder head:

- Leaking or damaged cylinder head gasket
- Loose spark plugWarpe