ok, new plugs new oil/filter the whole basic minor tune up. all went well but found some small pieces of metal floating around in the filter housing. this bike is new to me, maybe put 100-200 miles on it last fall. my first bike, im a newbie. im not a mechanic but i know more about cars than bikes, but its all relative right? what am i lookin at here, just wear from the cylinders, rings? is this engine gonna make it much longer? 74 550, speedo said 31K.