Cylinder Head Inspection; Cylinder Head Valve Spring; Valve/Valve Guide - Honda 2003 NPS50 Ruckus Service Manual

CYLINDER HEAD/VALVES
Avoid damaging the Remove the carbon deposits from the combustion
mating and valve chamber and clean off the head gasket surface.
seat surfaces.
INSPECTION
CYLINDER HEAD
Check the spark plug hole and valve areas for
cracks.
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 free length of the valve springs.
SERVICE LIMIT: IN/EX:32.2 mm (1.27 in)

VALVE/VALVE GUIDE

Check that the valve moves smoothly in the guide.
Check each valve for bends, burns, scratches or
abnormal wear.
Measure each valve stem
SERVICE LIMITS:
IN: 4.465 mm (0.1758 in)
EX: 4.455 mm (0.1754 in)
9- 1 2
D.O.
and record it.