Yamaha YZ450F(V) Owner's Service Manual page 370

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BALANCER
ASSEMBLY AND INSTALLATION
Balancer, balancer drive gear and balancer
driven gear
1. Install:
• Balancer driven gear 1
NOTE:
Install the balancer driven gear and balancer
shaft with their lower splines a aligning with
each other.
2. Install:
• Balancer drive gear 1
NOTE:
• Align the punched mark a on the balancer
drive gear with the punched mark b on the
balancer driven gear.
• Install the balancer driven gear and crank-
shaft with the lower splines c aligning with
each other.
3. Install:
• Lock washer 1
• Nut (balancer driven gear) 2
50 Nm (5.0 m · kg, 36 ft · lb)
• Primary drive gear 3
• Conical washer 4
• Nut (primary drive gear) 5
110 Nm (11.0 m · kg, 80 ft · lb)
• Straight key 6
• Balancer 7
• Lock washer 8
• Nut (balancer) 9
45 Nm (4.5 m · kg, 33 ft · lb)
NOTE:
• Apply engine oil to the contact surface and
threaded portion of the nut (primary drive
gear).
• Place an aluminum plate a between the
teeth of the balancer drive gear 0 and bal-
ancer driven gear A.
• Install the primary drive gear with its weight
reduction holes b facing the engine.
• Install the conical washer with its convex sur-
face c outward.
4. Bend the lock washer tab.
ENG