Cylinder - Yamaha WR250F(P) Owner's Service Manual

a
d
45°
135° 135°
c
3
CYLINDER AND PISTON
b e
4 - 48
2. Position:
Top ring
G
2nd ring
G
Oil ring
G
Offset the piston ring end gaps as
shown.
a Top ring end
b 2nd ring end
c Oil ring end (upper)
d Oil ring
e Oil ring end (lower)
3. Install:
Piston 1
G
Piston pin 2
G
Piston pin clip 3
G
NOTE:
Apply engine oil onto the piston pin and pis-
G
ton.
Be sure that the arrow mark a on the piston
G
points to the exhaust side of the engine.
Before installing the piston pin clip, cover the
G
crankcase with a clean rag to prevent the
piston pin clip from falling into the crankcase.
Install the piston pin clips with their ends fac-
G
ing downward.

Cylinder

1. Lubricate:
Piston
G
Piston ring
G
Cylinder
G
NOTE:
Apply a liberal coating of engine oil.
2. Install:
Dowel pin 1
G
O-ring 2
G
NOTE:
Apply the lithium soap base grease on the O-
ring.
ENG