My neighbor got a 34cc 4 stroke for free (well basically $12 for new carb I just ordered) its a briggs & stratton. I was thinking about helping him attach it to an old green murray would probably be perfect for a FWD setup. I don't know what would be the best chain to use but I was thinking 35 chain or pocketbike chain. I could just get a sprocket welded on the clutch bell but don't know how long it would last.