Balancer Drive Gear And Driven Gears; Primary Gears And Starter - Yamaha YFM250XL(C) Service Manual

INSPECTION AND REPAIR
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Crankshaft reassembling point:
The crankshaft 1 and the crank pin 2 oil
passages must be properly interconnected
with a tolerance of less than 1 mm (0.04 in).
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BALANCER DRIVE GEAR AND DRIVEN
GEARS
1.Inspect:
Balancer drive gear teeth 1
Balancer driven gear teeth 2
Wear/Damage → Replace both gears.

PRIMARY GEARS AND STARTER

1.Inspect:
Drive gear 1
Driven gear 2
Scratches/Wear/Damage → Replace.
Excessive noises during operation →
Replace both gears.
2.Inspect:
Idler gear 1 (starter)
Idler gear shaft 2
Scratches/Wear/Damage → Replace.
Driven gear 3 (starter)
Roller contact surface 4
Bearing 5 (driven gear)
Scratch/Wear/Damage → Replace starter
driven gear assembly.
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Starter clutch operation
Install the starter driven gear to the starter
clutch, and hold the starter clutch.
When turning the starter driven gear
counter clockwise Å, the starter clutch
and the driven gear should be engaged.
If not, the starter clutch is faulty. Replace it.
When turning the starter driven gear
clockwise ı, the starter driven gear
should turn freely. If not, the starter clutch
is faulty. Replace it.
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