Yamaha RX10K Supplementary Service Manual page 315

CRANKCASE
2nd step:
S Measure piston skirt diameter "P" with the
micrometer.
a 5 mm (0.20 in) from the bottom edge of the piston.
Piston size (standard) (P):
73.955 X 73.970 mm
(2.9116 X 2.9122 in)
S If out of specification, replace the piston and
piston rings as a set.
3rd step:
S Calculate the piston-to-cylinder clearance
with the following formula.
Piston-to-cylinder clearance =
Cylinder bore "C" –
Piston skirt diameter "P"
Piston-to-cylinder clearance:
0.030 X 0.055 mm
(0.0012 X 0.0022 in)
<Limit>: 0.12 mm (0.0047 in)
S If out of specification, replace the cylinder,
and the piston and piston rings as a set.
3. Measure:
S Side clearance (piston rings)
Use the thickness gauge 1
Out of specification ! Replace the piston
and piston rings as a set.
NOTE:
Eliminate the carbon deposits from the piston
ring grooves and rings before measuring the
side clearance.
Piton rings side clearance:
Top ring
0.030 X 0.065 mm
(0.0012 X 0.0026 in)
2nd ring
0.020 X 0.055 mm
(0.0008 X 0.0022 in)
5-48
ENG