1981-1984 Official Honda ATC250R Shop Manual, Page 57Get this manual
ATe 250R Remove the reed valve from the cylinder
CYLINDER HEADCYLINDERPISTON
REED VALVE
REED VALVE INSPECTION
Check the reed for damage or fatigue and replace if necessaryReplace the valve with new one if the seat rubber is cracked or damaged, or if there is clearance between the reed and seatCAUTION:
Do not disassemble or bend the reed stopper as this may cause improper engine performanceThe reed l'alve must not be disassembledIf the stopper, reed or seat is faulty, replace the assemblv