Installing The Piston And Cylinder - Yamaha Grizzly550 User Manual

Piston-pin-to-piston-pin-bore
clearance
0.004–0.024 mm (0.0002–0.0009
in)
Limit
0.0740 mm (0.0029 in)
EAS24450

INSTALLING THE PISTON AND CYLINDER

1. Install:
• Lower oil ring rail "1"
• Oil ring expander "2"
• Upper oil ring rail "3"
• 2nd ring "4"
• Top ring "5"
TIP
Be sure to install the piston rings so that the
manufacturer's marks or numbers face up.
2. Install:
• Piston "1"
• Piston pin "2"
• Piston pin clips "3" New
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.
1
a
3. Install:
• Cylinder gasket New
• Dowel pins
4. Lubricate:
• Piston
• Piston rings
• Cylinder
5. Offset:
• Piston ring end gaps
6. Install:
• Cylinder "1"
• Timing chain guide (exhaust side)
TIP
• 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. Install:
2
• Cylinder bolts "1"
3
New TIP
Lubricate the cylinder bolt "1" threads and mat-
ing surface with engine oil.
5-32
CYLINDER AND PISTON
(with the recommended lubricant)
Recommended lubricant
Engine oil
e
120˚
120˚
d
45˚
A
a. Top ring
b. Oil ring expander
c. Upper oil ring rail
d. Lower oil ring rail
e. 2nd ring
A. Exhaust side
1
a
b
120˚
90˚
c
45˚
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