OK .. here's the scoop.. was riding through the beautiful canadian rockies when i came upon a small town.. slowed down in costruction and noticed some pining from what sounded the bottom end. then knocking (not constant) . At first i thoght it was the stator rotor because i run an open belt primary and have tore a few out due to hard riding and rocks.(2001 fatboy with a 124 ci stuffed in) . so... put it into the back of the truck imediatly! Got to where we were going and the next day took it to a harley guy , started it in the back of the truck. no noise . unloaded it , run it for about 3 mins to heat it up , started pinging. he figured it was in the bottom end. loaded it back into the truck. got home and had another buddy (who is a motorcycle mechanic) listen to it . same thing ,started quiet, but soon after it warmed up , pinging , THEN started a horible clacking noise on every stroke of the pistons. in the process of tearing it apart now . just wondering if anyone has any similar experiences or can give me any ideas on where to look before i get REAL deep in the pig . im guessing its gonna be a total rebuild but though i would pick a few brains. Thanx in advance for and words of wisdom fron a great community of bikers . Cheers!