Installing The Transmission - Yamaha YZ125 2022 Owner's Service Manual

3. Check:
• Transmission gear
Blue discoloration/pitting/wear  Replace
the defective gear(s).
• Transmission gear dog
Cracks/damage/rounded edges  Replace
the defective gear(s).
4. Check:
• Transmission gear movement
Rough movement  Replace the defective
gear(s).
EAM30157

INSTALLING THE TRANSMISSION

1. Install:
• 6th pinion gear (18T) "1"
• 3rd/4th pinion gear (17T/17T) "2"
• 5th pinion gear (17T) "3"
• 2nd pinion gear (15T) "4"
(to the main axle "5")
TIP
Apply the molybdenum disulfide oil on the inner
and end surface of the idler gear and on the in-
ner surface of the sliding gear, then install.
5
1
4
2. Install:
• 2nd wheel gear (29T) "1"
• 5th wheel gear (20T) "2"
• 3rd wheel gear (27T) "3"
• 4th wheel gear (23T) "4"
• 6th wheel gear (19T) "5"
• 1st wheel gear (31T) "6"
(to the drive axle "7")
TIP
• Apply the molybdenum disulfide oil on the in-
• Apply the molybdenum disulfide grease on the
3. Install:
TIP
• Be sure the circlip sharp-edged corner "a" is
• Be sure the circlip end "c" is positioned at axle
2
3
5-48
TRANSMISSION
ner and end surface of the idler gear and on the
inner surface of the sliding gear, then install.
inner surface of the 4th wheel gear, then install.
5
6
1
7
• Washer "1"
• Circlip "2"
New
positioned opposite side to the washer and
gear "b".
spline groove "d".
M
4
3
2
G