Yamaha YZ450FW Manuel D'atelier Du Proprietaire page 368

BALANCER
REMOVAL POINTS
Balancer, balancer drive gear and balancer
driven gear
1. Straighten the lock washer tab.
2. Loosen:
• Nut (balancer) 1
• Nut (primary drive gear) 2
• Nut (balancer driven gear) 3
NOTE:
Place an aluminum plate a between the teeth
of the balancer drive gear 4 and balancer
driven gear 5.
INSPECTION
Primary drive gear, balancer drive gear and
balancer driven gear
1. Inspect:
• Primary drive gear 1
• Balancer drive gear 2
• Balancer driven gear 3
Wear/damage → Replace.
Balancer
1. Inspect:
• Balancer
Cracks/damage → Replace.
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ENG