Yamaha YZ250N Owner's Service Manual page 268

Yz series
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CYLINDER HEAD, CYLINDER AND PISTON
3. Install:
9Piston 1
9Piston pin 2
9Piston pin clip 3
NOTE:
9The arrow a on the piston dome must point to
exhaust side.
9Before installing the piston pin clip, cover the
crankcase with a clean rag to prevent the pis-
ton pin clip from falling into the crankcase cavi-
ty.
cC
Do not allow the clip open ends to meet the
piston pin slot
EC475382
Cylinder head and cylinder
1. Apply:
9Engine oil
To piston 1 piston ring 2 and cylinder sur-
face.
2. Install:
9Cylinder 1
cC
Make sure the piston rings are properly
positioned. Install the cylinder with one
hand while compressing the piston rings
with the other hand.
NOTE:
After installing, check the smooth movement of
the piston.
3. Install:
9Nut (cylinder) 1
NOTE:
Tighten the nuts in stage, using a crisscross pat-
tern.
4-29
ENG
b b .
35 Nm (3.5 m•kg, 25 ft•lb)

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