As I posted before, I'm entirely new to motorized bikes. I might be biting off more than I can chew as a newbie, but I'm wanting to put a motor on a fatbike, using a shifter kit (to avoid problems with chain alignment around the 4" tires) So, I have all these awesome ideas as to what I want to create, and while I think I know the bike I want to use, I'm a bit more cautious when it comes to the engine. I don't want to put a ton of energy into something just to find out I've got some POS made in Vietnam engine that is going to ruin the entire project. With that in mind, I'd love some suggestions as to what sites sell good engines, what brands to look for, and also what needs to be avoided like the plague. I'd prefer 2 stroke (used to own a 2t 150cc Vespa that I loved, and it was totally easy to maintain) and would love to get something with a little more kick than the typical 50cc engine kits that I see a lot of the time: 80cc would be awesome! edit: Ok, additional question. After a bit of searching I've been seeing something about 66cc/80cc engines. Which is it? I mean, when one gets one of these what exactly are they getting?