Cylinder Head Inspection - Honda TRX680FA Service Manual

CYLINDER HEAD/VALVE/CAMSHAFT
CYLINDER HEAD INSPECTION
CYLINDER HEAD
Be careful not to Remove the carbon deposits from the combustion
damage the gasket chamber, being careful not to damage the gasket
surface, surface.
Check the spark plug hole and valve areas for
cracks.
COMBUSTION CHAMBER
Check the cylinder head for warpage with a straight
edge and feeler gauge.
SERVICE LIMIT: 0.05 mm (0.002 in)
VALVE SPRING
Measure the valve spring free length.
SERVICE LIMITS: Inner: 36.3 mm (1.43 in)
Outer: 43.1 mm (1.70 in)
VALVE/VALVE GUIDE
Check that the valve moves smoothly in the guide.
Check the valve for bending, burning or abnormal
wear.
Measure each valve stem O.D. and record it.
SERVICE LIMITS: IN: 5.45 mm (0.215 in)
EX: 5.43 mm (0.214 in)
9-11