I am not sure if this is of much help. Firstly, no, I haven't experienced the kind of surging you are talking about. However, when I start the bike and let the bike warm up a couple minutes, especially after a cold night (and I leave the bike outside as I don't have a garage), I could hear small clicking sounds along with the sounds as if the throttle is adjusting itself gently. I think this is where the fuel injections are at work. In addition, I have got into the habit of reving it up to over 4000rpm a couple times during the warmup. I read it somewhere it's good for the bike especially on cold start. At the end of the warmup, the clicking sound subsides and the engine sound stabilizes. If I don't let the bike warm up properly, the idling speed is on the high side closer to 2000rpm rather than 1500rpm as indicated in the manual. After a while, the idling speed would go back to normal. Still, I have not experienced the surging you are talking about. My point is that if you haven't done so, perhaps warming up the bike first would help? Just a wild guess.