ok here we have my new project i won on ebay cr250 1985????fully rebuilt motor ha got home put water in bike and changed oil sounded ok for a lovely 3mins then massive knocking noise should of known something was wrong when the old guy said it had no water!!anyway what can you do,now im trying to find out if its even a 85 model the vin is JH2ME0309FC707448 ANY HELP WOULD BE GREAT THANKS..