Yamaha YFM660FS, Supplementary Service Manual

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4 - 37
ENG
CYLINDER AND PISTON
2.Position:
●
Top ring
●
2nd ring
●
Oil ring
Offset the piston ring end gaps as shown.
a
Top ring end
b
Oil ring end (lower)
c
Oil ring end (upper)
d
2nd ring end
3.Install:
●
Piston
1
●
Piston pin
2
●
Piston pin clips
3
NOTE:
●
Apply engine oil onto the piston pin, piston
ring and piston.
●
Be sure that the arrow mark
a
on the piston
points to the exhaust side of the engine.
●
Before installing the piston pin clip, cover the
crankcase with a clean rag to prevent the
piston pin clip from falling into the crankcase.
4.Lubricate:
●
Piston
●
Piston rings
●
Cylinder
NOTE:
Apply a liberal coating of engine oil.
INSTALLING THE CYLINDER
1.Install:
●
Cylinder
●
O-ring
●
Bolts (M10)
●
Bolts (M6)
NOTE:
Install the cylinder with one hand while com-
pressing the piston rings with the other hand.
CAUTION:
●
Be careful not to damage the timing chain
damper during installation.
●
Pass the timing chain through the timing
chain cavity.
New
New
T
R
.
.
42 Nm (4.2 m • kg, 30 ft • lb)
T
R
.
.
10 Nm (1.0 m • kg, 7.2 ft • lb)