Yamaha TT-R90E Owner's Service Manual page 222

CYLINDER AND PISTON
2. Position:
Top ring
G
2nd ring
G
Oil ring
G
Offset the piston ring end gaps as
shown.
a Top ring end
b Oil ring end (lower)
c Oil ring end (upper)
d 2nd ring end
3. Install:
Piston 1
G
Piston pin 2
G
Piston pin clips 3
G
NOTE:
Apply engine oil onto the piston pin, piston
G
ring and piston.
Be sure that the arrow mark a on the piston
G
points to the exhaust side of the engine.
Before installing the piston pin clip, cover the
G
crankcase with a clean rag to prevent the
piston pin clip from falling into the crankcase.
4. Lubricate:
Piston
G
Piston rings
G
Cylinder
G
NOTE:
Apply a liberal coating of engine oil.
Cylinder
1. Install:
Dowel pins
G
Gasket
G
Cylinder 1
G
NOTE:
Install the cylinder with one hand while com-
pressing the piston rings with the other hand.
CAUTION:
Be careful not to damage the timing chain
G
damper during installation.
Pass the timing chain through the timing
G
chain cavity.
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ENG
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New