Yamaha TW200 Service Manual page 109

INSPECTION AND REPAIR
I
ENG
I' ..
I
CD
p
307-001
4-29
, I
2nd steps
I
-Measure the piston skirt diameter lip" with
a micrometer.
CD
7.5 mm (0.295 in) from the piston bottom
edge
~
Piston Size P:
Standard
66.935 - 66.985 mm
(2.635-2.637
in)
Oversize 2 67.5 mm (2.66 in)
Oversize 4 68.0 mm (2.68 in)
-If out of the specification, replace the piston
and piston rings as a set.
13rd steps
I
- Find the piston-to-cylinder clearance with fol-
lowing formula.
Piston-to-cylinder clearance =
Cylinder bore IIC"_
Piston skirt diameter lip"
I~
Piston-to-cylinder Clearance:
0.025-0.045
mm
(0.001-0.002
in)
Limit:
0.1
mm
(0.004
in)
-If out of the specification, rebore or replace
the cylinder, and replace the piston and piston
rings as a set.
Piston ring oversize:
Oversize Mark
2 50
4
100
NOTE:
Oversize mark is stamped on the top of the
ring.