Yamaha YZ450F Fahrer- Und Wartungshandbuch Seite 336

a d
45
135 135
c
3
CYLINDER AND PISTON
b e
New
4 - 48
2. Position:
• Top ring
• 2nd ring
• Oil ring
Offset the piston ring end gaps as shown.
a Top ring end
b 2nd ring end
c Oil ring end (upper)
d Oil ring
e Oil ring end (lower)
3. Install:
• Piston 1
• Piston pin 2
• Piston pin clips 3
NOTE:
• Apply engine oil onto the piston pin and pis-
ton.
• Be sure that the arrow mark a on the piston
points to the exhaust side of the engine.
• Before installing the piston pin clip, cover the
crankcase with a clean rag to prevent the
piston pin clip from falling into the crankcase.
• Install the piston pin clips with their ends fac-
ing downward.
4. Lubricate:
• Piston
• Piston rings
• Cylinder
NOTE:
Apply a liberal coating of engine oil.
Cylinder
1. Install:
• Dowel pins
• O-ring
New
• Gasket 1
New
• Cylinder 2
NOTE:
Install the cylinder with one hand while com-
pressing the piston rings with the other hand.
CAUTION:
• Pass the timing chain 3 through the tim-
ing chain cavity.
• Be careful not to damage the timing chain
guide 4 during installation.
2. Install:
• Bolt (cylinder)
10 Nm (1.0 m · kg, 7.2 ft · lb)
ENG
New