Checking The Balancer Weight Gear - Yamaha YFM250RX 2008 Service Manual

OIL PUMP AND BLANCER WEIGHT GEAR
Inner-rotor-to-outer-rotor-tip
clearance
0.150 mm (0.0059 in)
Limit
0.23 mm (0.0091 in)
Outer-rotor-to-oil-pump-housing
clearance
0.100 ~ 0.151 mm
(0.0039 ~ 0.0059 in)
Limit
0.22 mm (0.0087 in)
Oil-pump-housing-to-inner-and-
outer-rotor clearance
0.04 ~ 0.09 mm
(0.0016 ~ 0.0035 in)
Limit
0.16 mm (0.0063 in)
3. Check:
• Oil pump operation
Rough movement → Repeat steps (1) and
(2) or replace the defective part(s).
CHECKING THE BALANCER WEIGHT
GEAR
1. Check:
• Balancer weight gear
• Buffer boss
• Compression spring
• Dowel pin
• Cracks/damage/wear → Replace.
4-54
ENG