Yamaha YFM7FGPW Service Manual page 198

1
a
e
120˚
120˚ 120˚
d
45˚ 45˚
È
1
CYLINDER AND PISTON
2. Install:
• piston 1
• piston pin 2
• piston pin clips 3
NOTE:
_
• Apply engine oil to the piston pin.
• Make sure the punch mark a on the piston
2
3
New
• Before installing the piston pin clips, cover
3. Install:
• cylinder gasket
• dowel pins
4. Lubricate:
• piston
• piston rings
• cylinder
5. Offset:
• piston ring end gaps
a
a Top ring
b Oil ring expander
c Upper oil ring rail
b
d Lower oil ring rail
90˚ e 2nd ring
È Exhaust side
c
6. Install:
• cylinder 1
• timing chain guide (exhaust side)
NOTE:
_
• While compressing the piston rings with one
• Pass the timing chain and timing chain guide
4 - 40
New
points towards the exhaust side of the cylin-
der.
the crankcase opening with a clean rag to
prevent the clips from falling into the crank-
case.
New
(with the recommended lubricant)
Recommended lubricant
Engine oil
hand, install the cylinder with the other hand.
(exhaust side) through the timing chain cav-
ity.
ENG