1981-1984 Official Honda ATC250R Shop Manual, Page 207Get this manual
ATe 250R Remove the rubber coverRemove the circlip and push rod from the master cylinder body
'82 ATC250R ADDENDUM
SNAP RING PLIERS
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PUSH ROD
Remove the master piston, primary cup and springIt may be necessary to apply small amount of air pressure to the fluid outlet to remove the master piston and primary cupClean all parts with brake fluid
SNAP RING
MASTER PISTON