The bike is tuned to pop. I tried to stop it a few times years ago but it's the nature of the beast. It's not an issue, it's a feature. Lean pop! You can stop it by tuning rich, or by pulling your "choke" out. Personally, I just accept it as a part of my favorite machine ever. Sort of like a slightly annoying habit of the woman I love, it sort of grows on me and I'd miss it if it was gone.