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CYLINDER AND PISTON
REMOVING THE PISTON AND PISTON
RINGS
1. Remove:
piston pin circlip 1
piston pin 2
piston 3
NOTE:
Before removing the piston pin circlip, cover the
crankcase opening with a clean towel or rag to
prevent the circlip from falling into the crank-
case cavity.
2. Remove:
top ring
2nd ring
oil ring
NOTE:
When removing the piston ring, open the end
gap of the ring by fingers, and push up the other
side of the ring.
CHECKING THE CYLINDER AND PISTON
1. Check:
piston wall
cylinder wall
Vertical scratches
cylinder, and replace the piston and piston
rings as a set.
2. Measure:
piston-to-cylinder clearance
a. Measure cylinder bore "C" with the cylinder
bore gauge.
NOTE:
Measure cylinder bore "C" by taking side-to-
side and front-to-back measurements of the
cylinder. Then, find the average of the measure-
ments.
Cylinder bore "C"
Taper limit "T"
Out of round "R"
"C" = Maximum D
"T" = (Maximum D
(Maximum D
"R" = (Maximum D
– (Minimum D
4 - 27
Rebore or replace the
54.00
54.015 mm
0.05 mm
0.005 mm
or D
) –
1
2
or D
)
5
6
, D
or D
)
1
3
5
, D
or D
)
2
4
6
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