I HAVE A 1968 85HP EVINRUDE MOTOR WE BELEIVE IT HAS AN EXHAUST LEAK BUT WERE NEW WITH BOATS WOULD ANYONE KNOW WHERE THE LEAK WOULD BE COMING FROM WHERE ARE THE GASKETS LOCATED AND ETC. WHEN THE COVER IS OFF IT RUNS FINE WHEN ITS ON IT LOSES POWER BIG TIME IF ANYONE KNOWS PLEASE LET ME KNOW