Yamaha XT250X 2008 Service Manual page 175

Make sure the arrow mark "a" on the piston
G
points towards the exhaust side of the cylinder.
Before installing the piston pin clip, cover the
G
crankcase opening with a clean rag to prevent
the clip from falling into the crankcase.
3. Lubricate:
Piston
G
Piston rings
G
Cylinder
G
(with the recommended lubricant)
Recommended lubricant
Engine oil
4. 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 (0.79 in)
5. 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
All manuals and user guides at all-guides.com
5-29
CYLINDER AND PISTON
(exhaust side) through the timing chain cavity.