Removing The Transmission; Checking The Shift Forks; Checking The Shift Drum Assembly - Yamaha YZF-R1 2020 Service Manual

EAS30430

REMOVING THE TRANSMISSION

1. Remove:
• Drive axle assembly "1"
• Shift drum retainers "2"
• Shift fork guide bars
• Shift fork-L
• Shift fork-R
• Shift drum assembly
• Shift fork-C
2. Remove:
• Bearing housing "1"
• Main axle assembly "2"
a. Insert two bolts "3" of the proper size, as
shown in the illustration, into the main axle
assembly bearing housing.
3
b. Tighten the bolts until they contact the
crankcase surface.
c. Continue tightening the bolts until the main
axle assembly comes free from the upper
crankcase.
3. Remove:
• Oil delivery pipe 3 "1"
• Bearings "2"
1
1
2
2
1
2
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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.
G089022
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
(along the shift fork guide bar)
Rough movement → Replace the shift forks
and shift fork guide bar as a set.
G089023
4. Check:
• Shift fork guide bar (for the shift fork-C) oil
passage
Clogging/damage → Replace the shift fork
guide bar (for the shift fork-C).
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CHECKING THE SHIFT DRUM ASSEMBLY

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