ok I have an 02 haratage springer it has 43000 miles on it and after some hard running I noticed a lowend knock at ide. only at times. if I drive it 35 - 50 mph and come back down to ider the knock is usly there but if I ride it 55 plus and come down to idle it make no noise. shut it off it will some times knock and some times not. as soon as you com off idle under any load it goes away. took it on a 400 mile trip and didn't get any louder. sounds like a wrist pin or piston slap. but its down low. im thinking it could be the compisator nut but not sure. any ideas.