Yamaha RX10K Supplementary Service Manual page 316

CRANKCASE
4. Install:
S Piston ring
(into the cylinder)
NOTE:
Level the piston ring in the cylinder with the pis-
ton crown.
a 5 mm (0.20 in)
5. Measure:
S End gap (piston rings)
Out of specification ! Replace the piston
rings as a set.
NOTE:
The oil ring expander spacer's end gap cannot
be measured. If the oil ring rail's gap is exces-
sive, replace all three piston rings.
Piston ring end gap:
Top ring
0.32 X 0.44 mm
(0.010 X 0.020 in)
2nd ring
0.43 X 0.58 mm
(0.017 X 0.023 in)
Oil ring
0.10 X 0.35 mm
(0.004 X 0.014 in)
6. Inspect:
S Piston pin
Blue discoloration/grooves ! Replace the
piston pin and then check the lubrication sys-
tem.
7. Measure:
S Outside diameter (piston pin)
Out of specification ! Replace the piston
pin.
Piston pin outside diameter:
16.991 X 17.000 mm
(0.6689 X 0.6693 in)
5-49
ENG