Inspection; Cylinder Head; Cleaning - Yamaha 50G Service Manual

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Å

INSPECTION

G61000-0*
INSPECTION

CYLINDER HEAD

CLEANING

1. Using a gasket scraper, remove all
traces of gasket material from the cylin-
der head.
2. Using a round scraper, remove carbon
deposits from the combustion chamber.
CAUTION:
Do not scratch the surfaces of the cylinder
and combustion chamber.
3. Using a soft brush, clean the water
jacket.
INSPECTION
1. Using a precision straight-edge and
thickness gauge, measure the surface
contacting
warping.
Warpage limit:
0.1 mm (0.004 in)
Å Lines indicate straight-line measurement
If the degree of warping exceeds this
specification, re-surface the cylinder-
head as follows:
Place 400-600 grit wet-or-dry paper on
the surface-plate, and resurface the cyl-
inder-head using a figure-eight sanding
pattern.
5-6
the cylinder block
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for