1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 195Get this manual
REAR WHEEL BRAKE DRIVE MECHANISM
Install and connect the drive chain with the master link and ringsInstall the master link clip
Adjust the drive chain and tighten the bearing holder mounting boltsTORQUE70-80 Nm 11.0-8.0 kg-m, 51-58 ftlb)
Install the rubber seal into the drive chain cover