1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 202Get this manual
REAR WHEEL BRAKEDRIVE MECHANISM ADJUSTING NUT
Install the bearing holder and drive chain adjuster with the four mounting bolts
Do not tighten the bolts before adjusting the drive chain Connect the brake rod to the brake arm and install the brake adjusting nut
DRIVE CHAIN ADJUSTER