I might have killed my less than 1 year old Yard Machine 190cc Briggs & Stratton engine. I went to use it for the 2nd time this year and added a quart of Penzoil 10W30 oil (later saw that the capacity was 20 oz) and filled the gas tank with 2 week old unleaded gas. While running, black smoke poured out the side. Eventually the smoke mostly subsided, but the engine sounded like it was half-heartedly running. Now I can't get the engine to start. From your perspective, is it worth taking the mower in for repair or should I bite the bullet and get a "better" one? BTW, I have no mechanical skills or anyone whom to ask for help. I will be grateful for all your help!