O.K we have now got the brigg 55 edge intek engine back on the mower . Set the valves as recommend .005 . The engine has new rings . Head gasket , top end bush & seal , the problem now is we fired it up today it stated .O.K mowed the lawn stop it re started it when it got a real tapping noise in it . Rechecked the valves settings which where right. check the camshaft all lined up like it shoud be . I think it may be the oil slingger / govenor arm catching we was able to reduce engine over reving the other day by adjusting the governor arm. but this is happening .