Checking The Shift Forks; Checking The Shift Drum Assembly; Checking The Transmission - Yamaha YFM70RY Service Manual

EAS26260

CHECKING THE SHIFT FORKS

The following procedure applies to all of the shift
forks.
1. Check:
• Shift fork cam follower "1"
• Shift fork pawl "2"
Bends/damage/scoring/wear → Replace the
shift fork.
1
2. Check:
• Shift fork guide bar
Roll the shift fork guide bar on a flat surface.
Bends → Replace.
EWA12840
WARNING
Do not attempt to straighten a bent shift fork
guide bar.
3. Check:
• Shift fork movement
Rough movement → Replace the shift forks.
2
5-70
EAS26270

CHECKING THE SHIFT DRUM ASSEMBLY

1. Check:
• Shift drum grooves
Damage/scratches/wear → 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 (0.0031 in)
2. Check:
• Transmission gears
Blue discoloration/pitting/wear → Replace
the defective gear(s).
• Transmission gear dogs
Cracks/damage/rounded edges → Replace
the defective gear(s).
TRANSMISSION
1