Yamaha YZ 2020 Series Owner's Service Manual page 251

TIP
• Install the spring "1" and relief valve "2", and
pin "3". After installing, make sure that the relief
valve "2" does not come loose.
• Install the relief valve before installing the pri-
mary drive gear and collar.
3
1
2
2. Install:
• Oil pump assembly "1"
• Oil pump assembly bolt "2"
Oil pump assembly bolt
5 N·m (0.5 kgf·m, 3.7 lb·ft)
LOCTITE®
LT
2 2
ECA13890
NOTICE
After tightening the bolts, make sure the oil
pump turns smoothly.
3. 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.
4. Install:
TIP
• Align the punched mark "a" on the balancer
• Install the balancer drive gear and crankshaft
1
5-64
1
2
• Balancer drive gear "1"
• Collar "2"
drive gear with the punched mark "b" on the
balancer weight gear.
with the lower splines "c" aligning with each
other.
1
1
2
OIL PUMP
a
b