i have a 1976 35 hp evinrude rope start. both cylinders have great spark being i just put new electrical everything on it. they jump a 1/4 inch easy. but when i start it, it is only running on the bottom cyl. i don't think fuel is an issue because the bottom cyl has plenty of it. but when i pull the top spark plug out it is not oily at all but very clean. so my first thought was that there is water in it. but there is no smoke. is it possible that if there was a little water in it that the spark plug would not fire right after i dried it and reinstalled?