Yamaha YZ450FX 2019 Owner's Service Manual page 255

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pump turns smoothly.
2. Install:
• Balancer weight gear "1"
TIP
Install the balancer weight gear and balancer
shaft with their lower splines "a" aligning with
each other.
1
LT
3. Install:
• Balancer drive gear "1"
TIP
• Align the punched mark "a" on the balancer
drive gear with the punched mark "b" on the
balancer weight gear.
• Install the balancer drive gear and crankshaft
with the lower splines "c" aligning with each
other.
a
a
1 1
4. Install:
• Lock washer "1"
New
• Balancer weight gear nut "2"
Balancer weight gear nut
50 N·m (5.0 kgf·m, 37 lb·ft)
• Primary drive gear "3"
• Conical washer "4"
New
• Primary drive gear nut "5"
Primary drive gear nut
80 N·m (8.0 kgf·m, 59 lb·ft)
• Straight key "6"
• Balancer "7"
OIL PUMP AND BALANCER GEAR
a
c
b
b
c
c
5-56
• Lock washer "8"
New
• Balancer nut "9"
Balancer nut
45 N·m (4.5 kgf·m, 33 lb·ft)
TIP
• Apply engine oil to the contact surface and
threaded portion of the primary drive gear nut.
• Apply engine oil to the contact surfaces of the
conical washer.
• Place an aluminum plate "a" between the teeth
of the balancer drive gear "10" and balancer
weight gear "11".
• Install the conical washer with its convex sur-
face "b" outward.
4 4
10
10
10
5
5
4 4
10
10
10
3
3
5. Bend the lock washer tab.
11
11
11
1
1
2 2
a
a
a
a
11
11
11
3
b
E
9
9 9
8
8
7
7
6
6

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