I have a 2002 Carberated road king. I have noticed recently a kind of "ping" when I shut the throttle down quickly. The noise is much more evident when the engine is cold and seems to go away as it gets up to temp. I thought it was the primary chain tension, I checked it cold at 7/8" to 1" and checked it again hot it was barely 3/8". The bike has 11,000 miles. I have owned it since 5,500 miles. I have never noticed the noise before. Looking for any help or suggestions.