Yamaha RX10K, Supplementary Service Manual

Page: 314 / 523

5-47
CRANKCASE
ENG
NOTE:
INSPECTION
1. Inspect:
S
Piston wall and cylinder wall
Vertical scratches
!
Rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
2. Measure:
S
Piston-to-cylinder clearance
Measurement steps:
1st step:
S
Measure cylinder bore “C” with the cylinder
bore gauge
1 .
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”
74.000
X
74.010 mm
(2.9134
X
2.9138 in)
Wear limit
74.06 mm
(2.9157 in)
Taper limit “T”
0.05 mm
(0.0020 in)
Out of round “R”
0.05 mm
(0.0020 in)
“C” = maximum of D
1
X
D
6
“T” = maximum of D
1
or D
2
– maximum of
D
5
or D
6
“R” = maximum of D
1
D
3
or D
5
– maximum of
D
2
D
4
or D
6
S
If out of specification, replace the cylinder, and
the piston and piston rings as a set.