Removing The Transmission; Checking The Shift Forks; Checking The Shift Drum Assembly - Yamaha YZ 2020 Series Owner's Service Manual

EAM30153

REMOVING THE TRANSMISSION

1. Remove:
• Long shift fork guide bar "1"
• Short shift fork guide bar "2"
• Shift cam "3"
• Shift fork 3 "4"
• Shift fork 2 "5"
• Shift fork 1 "6"
• Main axle "7"
• Drive axle "8"
• Collar "9"
TIP
• Remove assembly with the collar "9" installed
to the crankcase.
• Make a note of the position of each part. Pay
particular attention to the location and direction
of shift forks.
• Remove the main axle and the drive axle all to-
gether by tapping the drive axle lightly with a
soft hammer.
1
4
6
3
9
8
7
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CHECKING THE SHIFT FORKS

1. Check:
• Shift fork cam follower "1"
• Shift fork pawl "2"
Bends/damage/scoring/wear  Replace the
shift fork.
2
5
5-74
TRANSMISSION
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.
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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 as-