Yamaha YFM250RX 2008 Service Manual page 154

CYLINDER AND PISTON
5. Offset:
• Piston ring end gaps
Top ring
Upper oil ring rail
Oil ring expander
Lower oil ring rail
2nd ring
20 mm
6. Install:
• Cylinder
NOTE: 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 cavity.
7. Tighten:
• Cylinder bolts
Cylinder bolt
10 Nm (1.0 m•kg, 7.4 ft•lb)
4-38
ENG