I did a complete (except carbs) tune-up on the CB750: valves, points, cam chain, timing, plugs and she still ran like crap. I took the pods off and put on the stock airbox and it runs like a beast! I have a feeling the P.O. just put pods on without rejetting. And these bikes are not known for running well with pods anyway. I also think the cam chain wheel tensioner is probably chewed up pretty good inside, but it will last for now. This motor will be going in my '76 CB750 I got 7 years ago.