I have read through the forums and am now confused. On my sears bike it looks like it may have had a jackshaft. Would these frames have been created to work with JS applications and also without JS? My engine plate has the holes way over to the right so the engine shaft lines up with the rear sprocket. From what I have read this means mine did not come with a JS. I am sorry about the seemingly simple questions. I have been reading deep into the forums, and man can that get confusing.