Yamaha SR400 2014 Service Manual page 201

• 2nd ring "4"
• Top ring "5"
TIP
Be sure to install the 2nd ring so that the manu-
facturer's mark "N" faces up.
2. Install:
• Piston "1"
• Piston pin "2"
• Piston pin clip "3"
TIP
• Apply engine oil the piston pin.
• Make sure that the arrow mark "a" on the piston
points towards the exhaust side of the cylinder.
• Before installing the piston pin clip, cover the
crankcase opening with a clean rag to prevent
the clip from falling into the crankcase.
3
3. Lubricate:
• Piston
• Piston ring
• Cylinder
(with the recommended lubricant)
Recommended lubricant
Engine oil
4. Offset:
• Piston ring end gap
5
4
3
1
2
New
1
a
2
CYLINDER AND PISTON
120˚
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)
A. Exhaust side
5. Install:
• Timing chain guide
(exhaust side)
Timing chain guide bolt (exhaust
side)
8 Nm (0.8 m·kgf, 5.8 ft·lbf)
6. Install:
• O-ring
New
• Cylinder gasket "1"
• Dowel pin
• Cylinder "2"
Cylinder nut
38 Nm (3.8 m·kgf, 27 ft·lbf)
Cylinder bolt
12 Nm (1.2 m·kgf, 8.7 ft·lbf)
TIP
• While compressing the piston rings 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.
2
1
5-27
a
b
120˚
f
c
f
120˚
d
e
New