Checking The Transmission - Yamaha 2009 YFM25RY Service Manual

EAS26280

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 edges →
Replace the defective gear(s).
4. Check:
• Transmission gear engagement
(each pinion gear to its respective wheel
gear)
Incorrect → Reassemble the transmis-
sion axle assemblies.
TIP
When reassembling the main axle, press the
2nd pinion gear "1" onto it "2" as shown.
a. 102.2–102.4 mm (4.02–4.03 in)
5. Check:
• Transmission gear movement
Rough movement → Replace the defec-
tive part(s).
6. Check:
• Circlips
Bends/damage/looseness → Replace.
5-64
TRANSMISSION