Standard capacity is 373cc (12.6 oz.). If you're just changing fluid, spend alot of time pumping the old oil out and drain them for at least 30 minutes if possible. The damper still carries oil and the spring needs to drain off well.
Maximum capacity is 422cc, minimum capacity is 326cc.
50B TSCEC #408
2009 CRF250X, with all the good stuff on it