Yamaha WR450F(R) Owner's Service Manual page 428

ASSEMBLY AND INSTALLATION
Balancer, balancer drive gear and balancer
driven gear
1. Install:
Balancer 1
G
NOTE:
When installing 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.
2. Install:
Balancer driven gear 1
G
NOTE:
Install the balancer driven gear onto the bal-
ancer while aligning the punch mark a on the
balancer driven gear with the lower spline b
on the balancer end.
3. Install:
Balancer drive gear 1
G
NOTE:
Align the punched mark a on the balancer
G
drive gear with the punched mark b on the
balancer driven gear.
Align the punched mark c on the balancer
G
drive gear with the lower spline d on the
crankshaft.
4. Install:
Lock washer 1
G
Nut (balancer) 2
G
Primary drive gear 3
G
Nut (primary drive gear) 4
G
NOTE:
Install the primary drive gear with its stepped
G
side b facing the engine.
Place an aluminum plate a between the
G
teeth of the balancer drive gear 5 and
driven gear 6.
5. Bend the lock washer tab.
3
b
4 - 64
ENG
BALANCER
50 Nm (5.0 m · kg, 36 ft · lb)
75 Nm (7.5 m · kg, 54 ft · lb)