Looking for help. Last time I was riding my KDX220, the engine surged and began to run away. i pressed kill switch and shut it off. this happened twice. i am wondering if it has happened to anyone else and what the problem is??? Do i just need to clean carb or could it be something bigger? i am going to give this bike to my nephew who has never had a bike before and i don't want it to happen to him? Any suggestions.? Thanx