Yamaha YZ 2019 Series Owner's Service Manual page 255

• Oil pump assembly bolt "2"
Oil pump assembly bolt
5 N·m (0.5 kgf·m, 3.7 lb·ft)
LOCTITE®
LT
2
ECA13890
NOTICE
After tightening the bolts, make sure the oil
pump turns smoothly.
2. Install:
• Collar "1"
• Balancer weight gear "2"
TIP
Install the balancer weight gear and balancer
shaft with their lower splines "a" aligning with
each other.
1
2
3. 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.
OIL PUMP AND BALANCER GEAR
1 1
4. Install:
• Conical washer "1"
• 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"
• Primary drive gear nut "5"
Primary drive gear nut
75 N·m (7.5 kgf·m, 55 lb·ft)
• Balancer "6"
• Conical washer "7"
• Balancer nut "8"
Balancer nut
38 N·m (3.8 kgf·m, 28 lb·ft)
TIP
• Apply engine oil to the contact surface and
threaded portion of the primary drive gear nut.
• 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 the engine oil to the contact surface and
threaded portion of the balancer nut.
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