Yamaha YZ125(P)/LC, Owner'S Service Manual

Page: 256 / 564

4-22
ENG
CYLINDER HEAD, CYLINDER AND PISTON
EC474402
Piston pin and small end bearing
1. Inspect:
9
Piston pin
9
Small end bearing
Signs of heat discoloration
→
Replace.
2. Measure:
9
Piston pin outside diameter
Use micrometer
1
.
Out of limit
→
Replace.
3. Check:
9
Free play (when the piston pin
1
is in
place in the piston
2
)
There should be no noticeable for the play.
Free play exists
→
Replace piston pin
and/or piston.
4. Install:
9
Small end bearing
9
Piston pin
Into the small end of connecting rod.
5. Check:
9
Free play
There should be no noticeable free play.
Free play exists
→
Inspect the connecting
rod for wear/Replace the pin and/or con-
necting rod as required.
Piston pin outside diameter:
Standard <Limit>
14.995~15.000 mm 14.975 mm
(0.5904~0.5906 in) (0.5896 in)
5NY-9-30-4B 5/23/01 8:48 PM Page 10