Make sure the engine knock isn't anything more than the cam chain. Mine sounded really, really bad, the dealer tore it apart under warranty & that's what it turned out being.Thanks. Wish thats what it would turn out to be. Now that I have some parts I can swap out to check, I can get back to working on that one. I researched it years ago when I acquired it, and I remember doing a check on that and it turned out not to be that. Will report back in separate thread.