Reassembling The Top End Of The Motor; Reassemble The Piston - SHERCO 250 SEF-R Workshop Manual

REASSEMBLING THE TOP END OF THE MOTOR

Reassemble the piston

 Install the piston rings on the piston with
the end gaps as shown in the photo, the
compression ring goes in the top groove
and the oil control ring goes in the bottom
groove.
A Lower expander end gap
B Lower piston ring end gap
C Upper expander end gap
D Upper piston ring gap
ATTENTION : The expander rings do not
have a top or bottom; however the oil
control ring and the compression ring must
be installed with the « N » mark facing up.
 Apply engine oil to the wrist pin internal
bore in the piston.
 Carefully note the piston orientation (the
small cut outs are on the exhaust side)
 Install the locating pins [B].
 Install the base gasket [C].
 Use special tool number 1821 to maintain
the piston in the correct location [A].
ATTENTION : Use the same head gasket
(thickness 0.3 or 0.4mm depending on the
model).
 Place one of the cir clips in the special tool
number 2075 as shown in the photo; install
the clip close to one end of the tool.
 Use the tool to set up the clip for
installation on the wrist pin.
Install the circlip on the wrist pin.
 Mettre le poussoir de l'outil pour mettre en
place le clip.
 Mettre l'axe de piston.
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