Originally Posted by motoboyvfr
He's convinced that it needs a timing chain because its "running a little lean"
I would take his advice with a GIANT grain of salt. You only need a timing chain if there is rattly clacking coming from under the front cover and/or your timing marks get really jumpy under a timing light. There's no way your timing chain will affect your mixture. That's just a weird thing to say. I'd agree that it sounds more like a carb/intake/air leak issue.