Yamaha YZ250N Owner's Service Manual page 248

CYLINDER HEAD, CYLINDER AND PISTON
EC473000
REMOVAL POINTS
EC473220
Push rod
1. Remove:
9Bolt (push rod) 1
9Push rod 2
NOTE:
Insert the set pin 3 included in owner's tool kit
to remove the bolt (push rod).
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Be sure to use the set pin. If the set pin is
not used, the power valve constituent parts
will result in damage.
EC473401
Piston and piston ring
1. Remove:
9Piston pin clip 1
NOTE:
Before removing the piston pin clip, cover the
crankcase with a clean rag to prevent the pis-
ton pin clip from falling into the crankcase cav-
ity.
2. Remove:
9Piston pin 1
9Piston 2
9Small end bearing 3
NOTE:
Before removing the piston pin, deburr the clip
groove and pin hole area. If the piston pin
groove is deburred and piston pin is still difficult
to remove, use the piston pin puller 4.
Piston pin puller:
YU-1304/90890-01304
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Do not use a hammer to drive the piston
pin out.
4-19
ENG