My dad got a new trimmer, and i used it till it ran out. then i refueled it, and mixed oil with gas like it said. Except, i added too much oil and it started smoking too much. then i dumped some of it out and added more plain gas. it still started smoking, even though it had a lot less oil. Help?? It seemed to run fine even though it was smoking a lot, but i don't want to damage it. PS I know i am using the right oil and gas.