I have a late 60's Evinrude engine 40hp , sorry dont know what year or serial number somebody took the badge off. The problem is it will not go fast, I have had the carb proffesionaly rebuilt, I have checked the reed valves, and I also have done a compression test. The engine starts everytime, but it does rev high when in neutral and once you put it in gear it won't go at the speed it should.