Yamaha YZ250 2022, Owner'S Service Manual, Page: 205 / 274

TRANSMISSION
5-43
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:
• 5th pinion gear (21T) “1”
• 3rd pinion gear (18T) “2”
• Collar “3”
•
4th pinion gear (22T) “4”
•
2nd pinion gear (15T) “5”
(to the main axle “6”)
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.
2. Install:
• 2nd wheel gear (23T) “1”
•
4th wheel gear (24T) “2”
• 3rd wheel gear (23T) “3”
•
5th wheel gear (20T) “4”
• 1st wheel gear (27T) “5”
•
O-ring “6”
(to the drive axle “7”)
TIP
•
Apply the molybdenum disulfide oil on the in-
ner and end surface of the idler gear and on the
inner surface of the sliding gear, then install.
• Apply the lithium-soap-based grease on the O-
ring.
3. Install:
•
Washer “1”
•
Circlip “2”
TIP
• Be sure the circlip sharp-edged corner “a” is
positioned opposite side to the washer and
gear “b”.
•
Be sure the circlip end “c” is positioned at axle
spline groove “d”.
4. Install:
•
Collar “1”
TIP
•
Apply the lithium-soap-based grease on the oil
seal lip.
•
When installing the collar into the crankcase,
M
G
M
G
6
3
4
5
2
1
Ne w
6
7
3
2
4
5
1
M
G
G
Ne w