Checking The Shift Drum Assembly; Checking The Transmission; Assembly - Yamaha YFM250RX 2008 Service Manual

TRANSMISSION

CHECKING THE SHIFT DRUM ASSEMBLY

1. Check:
• Shift drum groove
Damage/scratches/wear → Replace the
shift drum assembly.
• Shift drum segment
Damage/wear → Replace the shift drum

assembly.

• Shift drum bearing
Damage/pitting → Replace the shift drum
assembly.

CHECKING THE TRANSMISSION

1. Measure:
• Main axle runout
(with a centering device and dial gauge)
Out of specification → Replace the main
axle.
Main axle runout limit
0.06 mm (0.0024 in)
2. Measure:
• Drive axle runout
(with a centering device and dial gauge)
Out of specification → Replace the drive
axle.
Drive axle runout limit
0.06 mm (0.0024 in)
3. Check:
• Transmission gears
Blue discoloration/pitting/wear → Replace
the defective gear(s).
• Transmission gear dogs
Cracks/damage/rounded
Replace the defective gear(s).
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edges