So here's the story. My old CDI went south. It would only fire the right side when I pulled it. Bought a Procom off of EBay, no joy. It would fire the left just fine, but the right would backfire like nobody's biz. To late to return it I bought another Procom from Newbonneville. It worked better, but was still running rough. Backfiring, stalling, what have you.

I gave up on Procom and bought a CDI from a '05 and installed it on my '04. Bike is running better, but I still get some backfire/hesitation from the left cylinder when I thwack the throttle off idle.

Is the advance/retard timing different for the 865 vs the 790? If so, would you suggest reprogramming my Procom CDI to solve these issues? And how would I go about that?

Thanks in advance.

Last edited by v150super; 04/19/2013 12:57 PM.

'04 Speedy. Emgo 19" turn-outs, Polaris bellmouth, 142/45 Thrux needles, 3.5 turns. Pod filters My Bike