Checking The Shift Drum Assembly; Checking The Transmission - Yamaha 2009 YZF-R1 (Y) Service Manual

3. Check:
• Shift fork movement
(along the shift fork guide bar)
Rough movement → Replace the shift
forks and shift fork guide bar as a set.
EAS26270

CHECKING THE SHIFT DRUM ASSEMBLY

1. Check:
• Shift drum groove
Damage/scratches/wear → Replace the
shift drum assembly.
• Shift drum segment "1"
Damage/wear → Replace the shift drum
assembly.
• Shift drum bearing "2"
Damage/pitting → Replace the shift drum
assembly.
EAS26300

CHECKING THE TRANSMISSION

1. Measure:
• Main axle runout
(with a centering device and dial gauge
"1")
Out of specification → Replace the main
axle.
Main axle runout limit
0.08 mm (0.0032 in)
2. Measure:
• Drive axle runout
(with a centering device and dial gauge
"1")
Out of specification → Replace the drive
axle.
Drive axle runout limit
0.08 mm (0.0032 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.
5-97
TRANSMISSION