Ill try not to make this too long, but here goes: Evinrude 40HP Big Twin 1970 Model #40052A, Serial #E01672. Put in new premium gear oil and new Champion J4C plugs. Compression was 105 on both cylinders, telltale showed good water flow. <br /><br />I took it out (it is on a 14 MFG Carefree...