Yamaha WR250F 2021 - Removing the Balancer; Checking the Oil Pump; Assembling the Oil Pump

OIL PUMP
5-62
EAM30133
REMOVING THE BALANCER
1. Remove:
• Oil pump
2. Loosen:
• Balancer nut “1”
• Primary drive gear nut “2”
• Balancer weight gear nut “3”
TIP
Place an aluminum plate “a” between the teeth
of the balancer drive gear “4” and balancer
weight gear “5”.
3. Check:
• Primary drive gear “1”
• Balancer drive gear “2”
• Balancer weight gear “3”
Wear/damage  Replace.
4. Check:
• Balancer
Crack/damage  Replace.
EAM30136
CHECKING THE OIL PUMP
1. Check:
• Oil pump cover
• Oil pump drive shaft
• Oil pump housing
Cracks/damage/wear  Replace the oil
pump assembly.
2. Check:
• Oil pump operation
Rough movement  Repeat step (1) or re-
place the oil pump assembly.
EAM30137
ASSEMBLING THE OIL PUMP
1. Install:
• Oil pump drive shaft “1”
• Inner rotor “2”
• Dowel pin “3”
TIP
• Apply the engine oil on the oil pump drive shaft
and inner rotor.
• Fit the dowel pin into the groove in the inner ro-
tor.
1
1
1
a
a
a
5
5
4
2
4
2
a
a
a
4
4
5
5
3
3
2
1
3