Cold Start "Cough": I've got a 2017 Manual AT with 8,000 miles. The bike has developed an annoying cold starting habit over the past years. It will start immediately, then will "cough" or slightly mis-fire a couple times during the first minute or two. It will happen both while idling or riding off within that first couple minute time period. It almost sounds like a slight backfire through the carbs, but is totally gone after a few minutes. Any thoughts???