Yamaha SX500D, Supplementary Service Manual

Page: 56 / 115

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CYLINDER HEAD AND CYLINDER
ENG
NOTE:
INSPECTION
1. Measure:
Piston-to-cylinder clearance
Measurement steps:
1st step:
Measure the cylinder bore “C” with a cylinder
bore gauge
1 .
Measure the cylinder bore “C” parallel to, and at
right angles to the crankshaft. Then find the av-
erage of the measurements.
Standard Wear limit
Cylinder bore
“C”
600:
65.000
65.014 mm
(2.5591 2.5596 in)
700:
70.50
70.52 mm
(2.775 2.776 in)
65.1 mm
(2.563 in)
70.6 mm
(2.780 in)
Taper “T” –
0.05 mm
(0.0019 in)
Out of round
“R”
–
0.01 mm
(0.0004 in)
C = Maximum D
T = (Maximum D
1
or D
2
) –
(Maximum D
5
or D
6
)
R = (Maximum D
1
, D
3
or D
5
) –
(Minimum D
2
, D
4
or D
6
)
If out of specification, replace cylinder, and
replace piston and piston rings as a set.
2nd step:
Measure the piston skirt diameter “P” with a
micrometer.
a 15 mm (0.59 in) from the piston bottom edge.
Piston size P (standard)
600: 64.930 64.935 mm
(2.5563 2.5565 in)
700: 70.425 70.430 mm
(2.7727 2.7728 in)