Removing The Transmission; Checking The Gears; Checking The Shift Fork, Shift Cam And Segment - Yamaha YZ125 2009 Owner's Service Manual

REMOVING THE TRANSMISSION

1. Remove:
• Main axle "1"
• Drive axle "2"
• Tap lightly on the transmission drive axle with
a soft hammer to remove.
• Remove assembly carefully. Note the position
of each part. Pay particular attention to the lo-
cation and direction of shift forks.

CHECKING THE GEARS

1. Inspect:
• Matching dog "a"
• Gear teeth "b"
• Shift fork groove "c"
Wear/damage → Replace.
2. Check:
• Gears movement
Unsmooth movement → Repair or replace.
TRANSMISSION, SHIFT CAM AND SHIFT FORK
4-63
CHECKING THE BEARING
1. Inspect:
• Bearing "1"
Rotate inner race with a finger.
Rough spot/seizure → Replace.
CHECKING THE SHIFT FORK, SHIFT CAM
AND SEGMENT
1. Inspect:
• Shift fork "1"
Wear/damage/scratches → Replace.
2. Inspect:
• Shift cam "1"
• Segment "2"
• Guide bar "3"
Wear/damage → Replace.