2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 562Get this manual
TROUBLESHOOTING 8Cylinder Compression Inspection
Test cylinder compressionIs the compression lowl
YES Valve clearance too small Valve stuck open Worn cylinder and piston rings Damaged cylinder head gasket Seized valve Improper valve timing
- GO TO STEP 9
9Fuel pump Inspection
Inspect the fuel flow
Is the fuel pump unit normal?
NOFaulty fuel pump unit (page 6-36)