Yamaha XT660R Service Manual page 278

120˚
e
120˚
f f
d
c
È
E
CYLINDER AND PISTON
a
120˚
b
E
5 - 39
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
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
New
• cylinder bolts
NOTE:
• Lubricate the cylinder bolt threads and mut-
ing surface with engine oil.
• Install the washers with their blunt surface
facing up.
8. Tighten:
= 116 mm (4.57 in) 1
• cylinder bolts
= 109 mm (4.29 in) 2
• cylinder bolts
Cylinder bolt
1st
15 Nm (1.5 m · kg, 11 ft · lb)
2nd
50 Nm (5.0 m · kg, 36 ft · lb)
• cylinder bolts (timing chain side) 3
ENG
10 Nm (1.0 m · kg, 7.2 ft · lb)