So I just purchased a 2005 kfx700 and when you start it up it sounds fine but when I start to rev it up and and idle rev it you hear a ticking/spitting noise coming from the engine. Also hear it when you are cruising down the street but when u get on it, it sounds fine no problems. Also back fires a little when u first start it up. Can anyone help me with them plug. Have no idea what it could be. He told me it may need the carbs cleaned but not sure if that would be the reason.