Yamaha YZ450FX 2019, Owner'S Service Manual

Page: 255 / 388

OIL PUMP AND BALANCER GEAR
5-56
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.
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.
4. Install:
•
Lock washer “1”
• Balancer weight gear nut “2”
•
Primary drive gear “3”
•
Conical washer “4”
•
Primary drive gear nut “5”
• Straight key “6”
•
Balancer “7”
•
Lock washer “8”
• Balancer nut “9”
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.
5. Bend the lock washer tab.
Balancer weight gear nut
50 N·m (5.0 kgf·m, 37 lb·ft)
Primary drive gear nut
80 N·m (8.0 kgf·m, 59 lb·ft)
1
c a
LT
1 1
c
b
a
c
b
a
New
T
R
.
.
New
T
R
.
.
Balancer nut
45 N·m (4.5 kgf·m, 33 lb·ft)
New
T
R
.
.
2 2
4 4
a a
10 10
1
11 11
10
1
11
4 4
a a
11 11
5
10 10
3
11
5
10
3
b 3
E
9 9
8
7
6
9
8
7
6