POWER UNIT 6-11
INSPECTION AND SERVICING
NOTE:
If excessive wear, crack, defective or other damage is found on
any component, replace.
CYLINDER HEAD
1. Remove all carbon from the combustion chamber.
NOTE:
• Do not use any sharp edged tool in order to scrape carbon off
the cylinder head or the head components.
• Be careful not to scuff or nick the metal surfaces when decar-
boning.
2. Inspect the cylinder head for crack in the intake and the
exhaust ports, the combustion chamber and the head sur-
face.
Valve seat
Inspect the valve seats for crack or other damage.
Cylinder head distortion
Using a straightedge and the thickness gauge, measure the
gasket surface of the cylinder head at a total of six locations as
shown in the figure.
09900-20803: Thickness gauge
Cylinder head distortion:
Service limit: 0.05 mm (0.002 in)
If the measurement exceeds the service limit, resurface or
replace the cylinder head.
NOTE:
The cylinder head can be resurfaced, using a surface plate and
a #400 grit wet sandpaper.
Move the cylinder head in a figure eight pattern when sanding.
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