I was planning on putting a 55i on an EF 88" Extra. I was looking at Cactus's site and I was surprised to see that the 3w-56 is the same horsepower and a little lighter. I would think that the 56 twin would be more like a 40cc single. How do these engines compare to each other. If they are about the same I would prefer the smoothness of the twin.

3W55i
Horsepower: 5.5
Weight: 4.2

3W56
Horsepower: 5.5
Weight: 4.10


Thanks!