On the 80 and 81 yt125, you do have adjustment in the rear bearing carrier. You have 3 bolts that hold the rear bearing carrier to the frame. Once you loosen those 3 bolts, the bearing carrier has some adjustment back and forth if you need it.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90