Yamaha WR450F(R) Owner's Service Manual page 167
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Also See for WR450F(R):
- Owner's service manual (754 pages) ,
- Owner's service manual (338 pages)
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CYLINDER AND PISTON
Cylinder bore "C"
Taper limit "T"
Out of round "R"
"C" = Maximum D
"T" = (Maximum D
– (Maximum D
"R" = (Maximum D
– (Minimum D
If out of specification, replace the cylinder,
G
and replace the piston and piston rings as
set.
2nd step:
Measure the piston skirt diameter "P" with
G
a micrometer.
a 8 mm (0.315 in) from the piston bottom edge
Standard
If out of specification, replace the piston
G
and piston rings as a set.
3rd step:
Calculate the piston-to-cylinder clearance
G
with following formula:
Piston-to-cylinder clearance =
Cylinder bore "C" –
Piston skirt diameter "P"
Piston-to-cylinder clearance:
0.040 ~ 0.065 mm
(0.0016 ~ 0.0026 in)
<Limit>: 0.1 mm (0.004 in)
If out of specification, replace the cylinder,
G
and replace the piston and piston rings as
set.
4 - 44
ENG
95.00 ~ 95.01 mm
(3.7402 ~ 3.7406 in)
0.05 mm (0.002 in)
0.05 mm (0.002 in)
or D
)
1
2
or D
)
5
6
, D
or D
)
1
3
5
, D
or D
)
2
4
6
Piston size "P"
94.945 ~ 94.960 mm
(3.738 ~ 3.739 in)
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