Yamaha YXR660FAS Service Manual download pdf (Page 180)

4 - 50

ENG

BALANCER GEARS AND OIL PUMP GEARS

REMOVING THE BALANCER DRIVE GEAR

AND BALANCER DRIVEN GEAR

1. Straighten the lock washer tabs.

2. Loosen:

• balancer driven gear nut 1

NOTE:

Place an aluminum plate 2 between the teeth

of the balancer drive gear 3 and balancer

driven gear 4.

3. Remove:

• circlip

• plate 1

• balancer drive gear 2

• springs 3

• pins 4

CHECKING THE OIL PUMP DRIVE GEAR

AND OIL PUMP DRIVEN GEAR

1. Check:

• oil pump drive gear 1

• oil pump driven gear 2

Cracks/wear/damage → Replace.

CHECKING THE BALANCER DRIVE GEAR

AND BALANCER DRIVEN GEAR

1. Check:

• balancer drive gear 1

• balancer driven gear 2

Damage/wear → Replace the balancer drive

gear and balancer driven gear as a set.

Excessive noise during operation →

Replace the balancer drive gear and bal-

ancer driven gear as a set.

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