Yamaha YZ125 2015 Owner's Service Manual page 109

4. Install:
• Collar "1"
• Apply the lithium soap base grease
on the oil seal lip.
• When installing the collar into the
crankcase, pay careful attention to
the crankcase oil seal lip.
5. Install:
• Main axle "1"
• Drive axle "2"
Apply the transmission oil on the
crankcase bearing.
INSTALLING THE SHIFT CAM AND
SHIFT FORK
1. Install:
• Shift fork 1 (L) "1"
• Shift fork 2 (C) "2"
• Shift fork 3 (R) "3"
• Mesh the shift fork 1 (L) with the 5th
wheel gear "4" and 3 (R) with the
6th wheel gear "6" on the drive axle.
• Mesh the shift fork 2 (C) with the
3rd/4th pinion gear "5" on the main
axle.
TRANSMISSION, SHIFT CAM AND SHIFT FORK
2. Install:
• Shift cam "1"
• Apply the transmission oil on the
shift cam.
• Install the shift cam while holding up
the 5th wheel gear "2" and keeping
the shift fork 1 "3" moved in the di-
rection of the arrow.
3. Install:
• Guide bar (short) "1"
• Guide bar (long) "2"
• Apply the transmission oil on the
guide bars.
• Be sure the long bar is inserted into
the shift forks 1 and 3 and the short
one into 2.
4-46
4. Check:
• Shifter operation
• Transmission operation
Unsmooth operation → Repair.