Yamaha MBK MW125 2014 Service Manual page 235

2. Install:
• Piston "1"
• Piston pin "2"
• Piston pin clips "3"
TIP
• Apply engine oil to the piston pin.
• Make sure the punch mark "a" on the piston
points towards the exhaust side of the cylinder.
• Before installing the piston pin clips, cover the
crankcase opening with a clean rag to prevent
the clips from falling into the crankcase.
New 3
1
a
3. Lubricate:
• Piston
• Piston rings
• Cylinder
(with the recommended lubricant)
Recommended lubricant
Engine oil
4. Offset:
• Piston ring end gaps
5
4
3
2
1
New
2
CYLINDER AND PISTON
b
45˚
e
a. Top ring
b. 2nd ring
c. Upper oil ring rail
d. Oil ring expander
e. Lower oil ring rail
A. Exhaust side
5. Install:
• Dowel pins
• Cylinder gasket
• Cylinder "1"
TIP
• While holding the piston with one hand, install
the cylinder with the other hand.
• Pass the timing chain and timing chain guide
(intake side) through the timing chain cavity.
5-32
c
a
135˚
45˚
d
45˚ 45˚
A
New
1