Yamaha XT660R, Service Manual

Page: 278 / 462

5 - 39
ENG
CYLINDER AND PISTON
5. Offset:
• piston ring end gaps
a
Top ring
b
Upper oil ring rail
c
Oil ring expander
d
Lower oil ring rail
e
2nd ring
f
20 mm (0.79 in)
È
Exhaust side
e
a
f f
d
c
b
120˚
120˚ 120˚
È
6. Install:
• cylinder
1
• timing chain guide (exhaust)
NOTE:
_
• While compressing the piston rings with one
hand, install the cylinder with the other hand.
• Pass the timing chain and timing chain guide
(exhaust side) through the timing chain cav-
ity.
7. Install:
• washers
• cylinder bolts
NOTE:
• Lubricate the cylinder bolt threads and mut-
ing surface with engine oil.
• Install the washers with their blunt surface
facing up.
1
New
8. Tighten:
• cylinder bolts = 116 mm (4.57 in)
1
• cylinder bolts = 109 mm (4.29 in)
2
• cylinder bolts (timing chain side)
3
T
R
.
.
Cylinder bolt
1st
15 Nm (1.5 m · kg, 11 ft · lb)
2nd
50 Nm (5.0 m · kg, 36 ft · lb)
2
1
3
3
E
E
T
R .
.
10 Nm (1.0 m · kg, 7.2 ft · lb)