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Here it is. The business end is covered in carbon. When the engine runs, I'm getting a lot of smoke from the exhaust. When I changed the oil, it wasn't bad. When my mower crapped out because the spark plug went bad, I was walking in a cloud.

I have a Bolens lawn mower with a 4.5 hp Briggs and Stratton engine. For the past five years it has been dependable with regular service, but I put in a new spark plug in May and I had to replace it last week. Usually the spark plugs last all season. I did change the oil at the start of the...