The little bog or burble can be a problem. I am waiting to ride it again, I changed the plugs and of course gapped them, put a new primary spring in (remember mines a 2013 kit) and put hilex to 42/46 to help faster back shift. Intake air is all good and exshaust valves are clean. We will try it again. It only does it once in a while at near or full throttle/ chop and back into it. If I work throttle a little shes right there no problem. I tried once when it bogged, and smashed the throttle full and left it there, acutually killed the engine. But it started right up and away we went. I have high hopes what I have done sense last ride will reduce it to hardly ever or never but we'll see, report after next ride. Love to tell ya my sled is perfect all day every day but thats not how life normally works with any type of mod, so will work at it a little and see what we come up with.