The oil is sprayed in right behind the throttle plates. So you will have some oil running back out of the throttle plates when the engine is shut off. But to have enough to drip out and onto the floor does seem excessive. Are the hoses hooked up to the lower corner of the air box. I agree the oil pump linkage needs to be checked. If your engine is running up to top RPM then I would bet you dont have a broken reed.