I live in a mooring field. And while I was driving from my boat to the dinghy dock . Suddenly my engine stopped. First I thought that I got water in it. Cause the sea was rough. Someone towed me in. And I added some seafoam with no luck. I drained the carb and put 2 new spark plugs in it and used carb/ choke cleaner. Still no result. The plugs sparks holding it next to the coil. One better though then the other. Has anyone a clue what it could be.