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or disintegrating damping rubber will contam-
inate the engine oil and will lead to excessive
engine noise.
Cam Chain Dampers
4.
Inspect the top cam chain damper (stopper
guide) and two
dampers for excessive wear. Any that shows
excessive wear should be replaced. Worn
dampers may indicate an improperly adjusted
or worn-out cam chain.
F. Cylinder
1. Inspect the cylinder walls for scratches. I f
vertical scratches are evident, the cylinder
wall should be rebored or the cylinder should
be replaced.
2. Measure cylinder wall wear
is excessive, compression pressure will de-
crease. Rebore the cylinder wall and replace
the piston and piston rings.
(2)
vertical (slipper-type)
as shown. I f wear
Cylinder wear should be measured a t three
depths with
a
stration.)
68.00~68.02mm
Cylinder bore
(2.677~2.678 in.)
Cylinder taper
Cylinder
out-of-round
If the cylinder wall is worn more than wear limit,
should be rebored.
G.
Piston And Piston Rings
1. Piston
a. Measure the outside diameter of t he piston a t
the piston skirt.
Measurement should be made a t a point l0mm
in.) above the bottom edge of the piston.
Place the micrometer a t right angles t o the
piston pin.
cylinder bore gauge. (See illu-
Standard
Wear Limit
68.10mm
(2.681 in.)
.
. . . . . . .
0.05mm
(0.002 in.)
0.05mm
(0.002 in.)
. . . . . . . .
it
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