Yamaha WR426F Manual De Servcio Del Propietario página 428

a
d
45°
135° 135°
c
3
CYLINDER AND PISTON
b e
New
4 - 47
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
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.
ENG
New