I believe I have put to much oil in my lawn mower. Will the problem eventually correct itself?

I believe I put too much oil in my 6.75 HP Briggs and Stratton lawn mower engine. I changed spark plugs and the thing started again but the new plug was immeidately left with a charred end. Still, the thing ran, if not at optimum efficiency. My question is: will this problem correct itself or will running the engine with too much oil in it only lead to more problems?