As I got older, I thought I would like a new motor that didn't weigh 75lbs like my old 2 cycle, 2 cylinder, mercury with electric start (which I never used). I bought a new 4 cycle, 6HP, single cylinder Mercury that weighed 55 lbs. I used it twice to get the sailboat out of the dock, and took it back and got a 9 HP, two cylinder motor that weighed 84lbs. The single cylinder engine vibrated the 23' sailboat so much, that it had to go!