Yamaha YZ450F(S), Owner'S Service Manual

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ENG
BALANCER
ASSEMBLY AND INSTALLATION
Balancer, balancer drive gear and balancer
driven gear
1. Install:
●
Balancer 1
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
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
NOTE:
●
Align the punched mark
a
on the balancer
drive gear with the punched mark
b
on the
balancer driven gear.
●
Align the punched mark
c
on the balancer
drive gear with the lower spline
d
on the
crankshaft.
4. Install:
●
Lock washer 1
●
Nut (balancer) 2
●
Primary drive gear 3
●
Nut (primary drive gear) 4
NOTE:
●
Apply the molybdenum disulfide grease on
the contact surface of the nut (primary drive
gear).
●
Install the primary drive gear with its stepped
side
b
facing the engine.
●
Place an aluminum plate
a
between the
teeth of the balancer drive gear 5 and
driven gear 6 .
5. Bend the lock washer tab.
T
R
.
.
50 Nm (5.0 m · kg, 36 ft · lb)
T
R
.
.
85 Nm (8.5 m · kg, 61 ft · lb)