Piston Pin And Small End Bearing - Yamaha YZ125N1 Service Manual

CYLINDER HEAD, CYLINDER AND PISTON
EC474402

Piston pin and small end bearing

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