David, it would be much better to clean out your fuel tank and carburetor to get it running properly again, rather than use starting fluid. The fluid is likely to harm your engine.
If you post the long string of numbers from the cooling air cowl on your engine, I can tell you some details about the engine and give you a link to the B&S overhaul page for your carburetor. We can help you with any questions you have along the way, too.
