Yamaha YZ250FX 2021, Owner'S Service Manual

Page: 250 / 378

OIL PUMP
5-64
4. Install:
• Balancer drive gear “1”
•
Collar “2”
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.
5. Install:
• Conical washer “1”
•
Balancer weight gear nut “2”
• Primary drive gear “3”
•
Conical washer “4”
• Primary drive gear nut “5”
•
Balancer “6”
• Conical washer “7”
•
Balancer nut “8”
TIP
• Apply engine oil to the contact surfaces of the
conical washer and the balancer nut “8”.
• Place an aluminum plate “a” between the teeth
of the balancer drive gear “9” and balancer
weight gear “10”.
•
Install the conical washer with its convex sur-
face “b” outward.
•
Align the balancer flat portion “c” with the flat
portion “d”.
•
Apply LOCTITE® to the primary drive gear nut
“5” within the area shown in the illustration.
Balancer weight gear nut
50 N·m (5.0 kgf·m, 37 lb·ft)
a
b
1
1
2
Ne w
T
R
.
.
Ne w
Primary drive gear nut
105 N·m (10.5 kgf·m, 77 lb·ft)
LOCTITE®
Balancer nut
38 N·m (3.8 kgf·m, 28 lb·ft)
T
R
.
.
Ne w
T
R
.
.
b
2
a a
2
10 10
9
1
2
10
9
1
b
5
3
a a
4 4
10 10
5 5
9 9
3 3
E
LT