Yamaha WR426F(N) Owner's Service Manual page 428

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CYLINDER AND PISTON

2. Position:

Offset the piston ring end gaps as

a Top ring end

b 2nd ring end

c Oil ring end (upper)

e Oil ring end (lower)

Piston pin 2

Piston pin clips 3

Apply engine oil onto the piston pin and pis-

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 rings

Apply a liberal coating of engine oil.

Install the cylinder with one hand while com-

pressing the piston rings with the other hand.

Pass the timing chain 3 through the tim-

ing chain cavity.

Be careful not to damage the timing chain

guide 4 during installation.

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