Piston; Maintenance - Yamaha YTZ250S 1986 Service Manual

PISTON
I SW40-55-12I
Removal
1. Remove the piston pin clip
CD
from the
piston. Push the piston pin out from op-
posite side. Remove the piston.
1. Piston pin clip
NOTE: ______________________ _
If the pin hangs up, use a piston pin puller. Do
not hammer on pin as damage to rod, piston
and bearing will result.
3-14
End gap
0.35-0.5
mm
(0.014-0.019
in)
Piston clearance
0.060 - 0.065 mm
(0.0024-0.0026 in)
I 6206C4I
~ISD~_5~121
-~
~
Maintenance
1. Using a rounded scraper, remove carbon
deposits from piston crown and ring
grooves.