Yamaha WR450F(R) Owner's Service Manual page 426

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REMOVAL POINTS

Balancer drive gear and balancer driven

1. Straighten the lock washer tab.

Nut (primary drive gear) 1

Nut (balancer) 2

Place an aluminum plate a between the teeth

of the balancer drive gear 3 and driven gear

When removing the balancer shaft, align the

center of the balancer shaft weight a along

the line connecting the centers of the crank-

shaft and balancer shaft.

Primary drive gear, balancer drive gear and

balancer driven gear

Primary drive gear 1

Balancer drive gear 2

Balancer driven gear 3

Wear/damage → Replace.

Cracks/damage → Replace.

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