I have a 1976 55 hp evinrude. It was running fine and started with no problems. I took it out on the lake and it ran fine. I shut it down for a couple hours while out on the water. Went to start it up to go in to shore and it would crank but not start. It seems to have lost the spark.<br />What could have caused this sudden loose of spark.<br />I had a new power pack and changed it out but it still did nothing but crank. I checked the fuel system and everything seem fine there to.<br />Any suggestions would be most helpfull. 