I have a 2004 1700 Roadstar Midnight Star, that has an engine knock under load. It has 17,000 miles. I don't know how long it has had this knock, but replaced the HardKrome Long Shots with stock exhaust, and now hear the knock. When downhill, or not under load I don't hear it. I adjusted the valves, but still have the noise. Anyone had a similar problem?