I rebuilt my motor a while back due to a oil pump meltdown. I split the cases and cleaned up the mess and replaced everything less the crank, head and half the tranny gears. I buttoned it back up and went for a nice, easy 2hr ride and changed the oil. Luckily I had a Zip-Ty magnetic plug cause there were rather large metal peices attached along with some metallic oil sludge. I figured it was contamination that I missed (maybe in the oil lines!?!?). I went for a 5 hr ride last Saturday and drained the oil to find more metal peices and metallic oil sludge. Not nearly as much as the first oil change, but enough to cause concern. Where could these peices have been flushed from? I split the cases, rebuilt the trans, blew compressed air through the oil lines and cleaned both case halves. The bike has about 7hrs on the rebuild and runs great. I dont think this is new contamination, but I cannot figure out where they could've originated from. Any ideas?