What I working on is a 2002 FLHTC 88CI w/ 62K miles, 26Gs, comp cam lifters, motor work 2 years old at 52K.The owner recently traveled to Tenn from S FL. Across the state line the motor started making noises. No loss of power. No starting issues. Spent 9.5 hours at SMHD in Maryville. a 18 year veteran tech found a loose comp nut, and took off both cylinders/heads and said nothing is apparently wrong. Customer WASN'T charged! Vehicle was ridden back to Miami. Upon my inspection the comp nut that was tightened but obviously not fully inspected is it took out the rotor. I replaced the rotor and spring "hat"and shimmed the nut. The "spring hat" was sacked out! First time I've seen this. Set the primary chain tension with the HB125. Cold, the sound starts off "dry" like little birds chirping, kinda like an old shovel stroker motor (sewing machine). As temps build the noises begin to start sounding like its in the valve train. In my experiences fairly stock motors with stock H-D parts rarely come apart. True? At least with their pistons and such. Not wanting to disregard a dealership's veteran's inspection, if I had to guess it sounds like possibly like a loose wrist pin. I'm aware anything is possible but even to me this seems unlikely as this machine is used and not abused. BTW during the last 2 oil changes there were ferrous metal deposits on his drain plugs. Ideas? THANK YOU. TK.