Yamaha YXR70FX Service Manual page 192

1
a
e
120˚
120˚ 120˚
d
20 mm (0.79 in) 20 mm (0.79 in)
c È
CYLINDER AND PISTON
2. Install:
• piston 1
• piston pin 2
• piston pin clips 3
TIP:
_
• 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 Upper oil ring rail
c Oil ring expander
d Lower oil ring rail
e 2nd ring
È Exhaust side
b
4 - 42
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
ENG