Yamaha YZ450FY 2009 Owner's Service Manual page 159

3. Install:
• Lock washer "1"
• Nut (balancer shaft driven gear) "2"
Nut (balancer shaft driven gear):
50 Nm (5.0 m•kg, 36 ft•lb)
• Primary drive gear "3"
• Conical washer "4"
• Nut (primary drive gear) "5"
Nut (primary drive gear):
110 Nm (11.0 m•kg, 80 ft•lb)
• Straight key "6"
• Balancer "7"
• Lock washer "8"
• Nut (balancer) "9"
Nut (balancer):
45 Nm (4.5 m•kg, 33 ft•lb)
• 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 shaft drive gear "10" and
balancer shaft driven gear "11".
• Install the conical washer with its convex sur-
face "b" outward.
4. Bend the lock washer tab.
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BALANCER