Yes, I'm 100% sure it has a bad cam. Yes, it's a single cylinder. Nice to know all I'll need is the engine gasket and not the set.
I've adjusted a few briggs engines, even my honda engine. I blue printed this engine so I knew for certain when it was on compression stroke. Absolutely, no movement in either exhaust or intake valve.
As for cam, can a cam from another single cylinder briggs be used, say a 14 hp?
Is there a cheaper source for a new cam?
Can the old cam be repaired?