A little ignition trouble a couple weeks ago, so I bought the Dyna S for my 850. Easy install, bit of a do figuring out the 2-3 timing without a proper mark as is found on 1-4 side. I got it pretty darn good, but I'll need to do the degree wheel thing for perfection before I go. I also adjusted the valves, glad I didn't wait as it needed it. Got new brakes for the front to put on, changed the oil with Rotella 15-40. Did a pull & look inspection of just about every wiring plug I could find. Lubed up the speedo & tack cables, still need to see about the condition of the clutch cable, I think it's newer, tho. Since I pulled the stock ignition, and it still works, I'm wondering if it's a good or bad idea to sell it. I had an intermittent no start problem that never resulted in a definite diagnosis. I cleaned up a couple wiring connections that were just tape jobs, and added another ground from the battery and did not get a repeat of the problem. Maybe somebody on the forum wants that little magic box for the cost of shipping? I think it's all good, it never missed a beat, I just wanted the peace of mind that comes with new Dyna stuff if I'm traveling. If I were just staying close to home I wouldn't have bothered.