1981-1984 Official Honda ATC250R Shop Manual, Page 194Get this manual
'82 ATC250R ADDENDUM
ATe 250R
Turn the stopper bolt out until the distance between the brake pedal arm and stopper rubber is 0.5-1.5 mm (116 in)NOTE: Do not allow the brake arm to contact the stopper rubber
LOCK NUT
Tighten the lock nutRecheck the brake pedal height and distance between the brake pedal arm and stopper rubber