Briggs and stratton spitting gas out carb.
OK heres my problem I have a Briggs and stratton 11hp engine on a murray riding mower, it has very little use and was given to me by my uncle who ran it on with to much oil. The engine would surge and spit gas out the carb so I suspected the intake valve not closing fully. I took off the head and found alot of carbon buildup especialy around the valves so I cleaned the valves with my wire wheel and then lapped then with lapping compound. Now I started the engine up and it runs worse, it spits more gas out the carb. What did I do wrong??!