1981-1984 Official Honda ATC250R Shop Manual, Page 193Get this manual
ATe 250R REAR BRAKE PEDAL HEIGHT
Check that the distance between the pedal and upper face of the footpeg is 9.5-10.5 mmin)CAUTION:
'82 ATC250R ADDENDUM
Improper brake pedal height adjustment can cause brake drag
ADJUSTMENT
Loosen the lock nut and screw the stopper bolt all the way in