That odd tensioner is only on the one side. Regarding the sprockets, I don't know if that is original to the machine or not. Mine is missing the tensioners for the transmission. When I gather up enough parts and enough time, I'm going to mock up the engine, trans and axles and my intention is to fab a more reliable tensioning system. I have to ask the group a question about the proper bearings, but that will be a new post.