Yamaha RS90RK, Service Manual

Page: 528 / 841

5-55
ENG
CRANKCASE
5. Remove:
• Piston pin clips
1
• Piston pin 2
• Piston
3
• Connecting rod 4
CAUTION:
Do not use a hammer to drive the piston pin
out.
NOTE:
• For reference during installation, put identification
marks on the piston crown.
• Before removing the piston pin, deburr the piston
pin clip’s groove and the piston’s pin bore area. If
both areas are deburred and the piston pin is still
difficult to remove, remove it with the piston pin
puller
5
.
Piston pin puller:
90890-01304, YU-01304
4
3
2
1
6. Remove:
• Top ring
• 2nd ring
• Oil ring
NOTE:
When removing a piston ring, open the end gap
with your fingers and lift the other side of the ring
over the piston crown.
7. Remove:
• Crankshaft
• Crankshaft journal bearing
NOTE:
Identify the position of each crankshaft journal
upper bearing so that it can be reinstalled in its orig-
inal place.