I've been having bog problems last season so I put new stock jets and cleaned my carbs well It seem like a rich problem last year with fouling plugs and bogging down on take off. I lowered my needle height one ring and re-adjusted pilot jets. Question is It runs much better but it was warm weather (0 degrees C) is it possible for it to become too lean with the new needle height in colder weather? even with stock jets. or would I have to go to a smaller main jet to worry about this.