I have a 1982 evinrude 15hp pull start motor. Both cylinders have 91 on the compression reading top spark won’t quite jump 7/16th of an inch but bottom will jump 1/2” I can smell fuel on the plugs so I’m guess it’s getting fuel and the carb looked clean when I took it apart. The fly wheel key is not sheared. When I spray alittle starting fluid in the carb and pull it over it makes what sounds like a back fire and a puff of white smoke but won’t crank at all. Any advice would be very well appreciated.