Yamaha YZ450FN 2022, Owner'S Service Manual, Page: 248 / 366

OIL PUMP
5-62
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)
Balancer nut
45 N·m (4.5 kgf·m, 33 lb·ft)
Ne w
T
R
.
.
Ne w
T
R
.
.
Ne w
T
R
.
.
2 2
4 4
a a
1
11 11
1
11
5 5
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