Unless you are willing and prepared to put in a ton of work, I would suggest not buying the 110 engine. It's big, sure, but the compression is very low and the port shape, position, timing, and holes in the iron sleeve are all terrible and need a bunch of work to even begin to make the same power as a good quality 66cc. Out of the box, a good 49cc engine actually makes more power.
This is from somebody that has one to tinker with, and decided it was less work to use it for a saw hybrid build.
This is from somebody that has one to tinker with, and decided it was less work to use it for a saw hybrid build.