Hi jackg, please post a picture of the model indentification plate, and the long series of engine identification numbers that I hope will be stamped on the cooling air cowl (the tin cover that extends from the cylinder head down around the recoil starter). With that information Deejay can tell you something about your mower, and the rest of us can discuss how to tidy up your engine.
Meanwhile I'm trying to figure out what that engine is: it looks something like a Briggs and Stratton, but doesn't have the right stickers on it, and has an air cleaner and some other details that are a bit Honda-like. It may turn out to be a fairly recent replacement of an original engine, which might or might not be an unlicensed Chinese copy of a Briggs. If so it probably won't have the stamped numbers on the air cowl.
So, we need some detail from you, and hopefully other members will join in, especially if they recognise that anonymous engine.