Yamaha 2004 Rhino 660 YXR660FAS, Service Manual

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4 - 35
ENG
CYLINDER AND PISTON
b. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
Standard Wear limit
Cylinder
bore “C”
100.005 ~
100.055 mm
(3.9372 ~
3.9392 in)
100.10 mm
(3.9410 in)
C =
X + Y
2
2nd step:
a. Measure piston skirt diameter “P” with a
micrometer.
b
2.5 mm (0.10 in) from the piston bottom edge
b.
If out of specification, replace the piston and
piston rings as a set.
3rd step:
a. Find the piston-to-cylinder clearance with
the following formula.
b. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
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Piston skirt diameter “P”
Standard
99.945 ~ 99.995 mm
(3.9348 ~ 3.9368 in)
Piston-to-cylinder clearance =
Cylinder bore “C” –
Piston skirt diameter “P”
Piston-to-cylinder clearance
0.050 ~ 0.070 mm
(0.0020 ~ 0.0028 in)
<Limit>: 0.15 mm (0.0059 in)