Yamaha YZ250F(N)/LC Owner's Service Manual page 382

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ASSEMBLY AND INSTALLATION

Balancer shaft, balancer shaft drive gear

and balancer shaft driven gear

Balancer shaft 1

Apply the engine oil on the bearing.

When installing the balancer shaft, align the

center a of the balancer shaft weight along

the line connecting the centers of the crank-

shaft and balancer shaft.

Balancer shaft driven gear 1

Install the balancer shaft driven gear onto the

balancer shaft while aligning the punch mark

a on the balancer shaft driven gear with the

lower spline b on the balancer shaft end.

Balancer shaft drive gear 1

Align the punched mark a on the balancer

shaft drive gear with the punched mark b on

the balancer shaft driven gear 2.

Align the punched mark c on the balancer

shaft drive gear with the lower spline d on

the crankshaft end.

Lock washer 1

Nut (balancer shaft driven gear) 2

Primary drive gear 3

Nut (primary drive gear) 4

Install the primary drive gear with its stepped

side a facing the engine.

Place an aluminum plate b between the

teeth of the balancer shaft drive gear 5 and

driven gear 6.

5. Bend the lock washer tab.

50 Nm (5.0 m · kg, 3.6 ft · lb)

75 Nm (7.5 m · kg, 54 ft · lb)

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