Took out my 06 SE Fatboy today and started to hear slight noise coming from front top end of engine got worse in a few miles started taping, skiping,shut it off brought it back to the shop,took the front valve cover off,can't see any thing wrong, but I did find some small metal flakes in the oil on top. There were engine mods done at local dealer before I bought it, I think a stage 1 kit CNC heads,cams,throtle body mod. etc. any ideas?