Yamaha WR250R Service Manual page 203

2
4. Lubricate:
Piston
G
Piston rings
G
Cylinder
G
(with the recommended lubricant)
Recommended lubricant
Engine oil
5. Offset:
Piston ring end gaps
G
a. Top ring
b. Upper oil ring rail
c. Oil ring expander
d. Lower oil ring rail
e. 2nd ring
f. 20 mm
6. Install:
Cylinder
G
Cylinder bolt
10 Nm (1.0 m•kg, 7.2 ft•lb)
NOTE:
While compressing the piston rings with one
G
hand, install the cylinder with the other hand.
Pass the timing chain and timing chain guide
G
(exhaust side) through the timing chain cavity.
a
1
New
3
5-29
CYLINDER AND PISTON