POWER UNIT 6-25
CYLINDER HEAD
Remove all carbon from combustion chambers.
NOTE:
• Do not use any sharp edged tool to scrape carbon off cylin-
der head or its components.
• Be careful not to scuff or nick metal surfaces when decarboning.
Inspect cylinder head for crack in intake and exhaust ports, com-
bustion chambers and head surface.
Valve seat
Inspect valve seat for crack or other damage.
Replace if necessary.
Cylinder head distortion
Using a straightedge and thickness gauge, measure cylinder
head distortion (gasket surface) at a total of six (6) locations as
shown in figure.
\ 09900-20803 : Thickness gauge
Cylinder head distortion :
Service limit : 0.05 mm (0.002 in.)
If measurement exceeds service limit, resurface or replace cyl-
inder head.
NOTE:
Cylinder head can be resurfaced, using a surface plate and
#400 grit wet sandpaper.
Move cylinder head in a figure eight pattern when sanding.
INSPECTION / SERVICING
NOTE:
If cracks, excessive wear or other damage is found on any com-
ponent, replace component.
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