6-12 POWER UNIT
INSPECTION/SERVICING
NOTE:
If cracks, excessive wear or other damage is found on any com-
ponent, replace component.
CYLINDER HEAD
Remove all carbon from combustion chambers.
NOTE:
• Do not use any sharp edged tool to scrape carbon off cylinder
head or its components.
• Be careful not to scuff or nick metal surfaces when decarbon-
ing.
Inspect the intake and exhaust ports, combustion chambers and
head surface.
If cracks or other damage is found, replace cylinder head.
Valve seat
Check the valve seat.
If cracks or other damage is found, replace cylinder head.
Cylinder head distortion
Using a straightedge and thickness gauge, measure the cylinder
head distortion (gasket surface) at a total of six (6) locations as
shown.
09900-20803: Thickness gauge
Service limit: 0.05 mm (0.002 in)
If measurement exceeds service limit, resurface or replace cylin-
der head.
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