Has Anyone Experimented With this?

It's not unreasonable, it may not be the easiest just depends on how much your gonna have to do. People on this site can put a chainsaw motor on a bike so there is no reason why it couldn't be done. basically if ya have a welder and a grinder you can put just about any engine on a bike. There was even some ridiculous thing I saw on here that was a BMX style bike with a huge street bike motor strapped in (Mind you I'm pretty sure that was a piece of crap), but it was done. So your goal is definitely not "out of the question".

Aren't they kind of the wrong shape to fit in the "V" of a bike frame??

Jim

So are the square 4 strokes that people on here use, but they make motor mounts for them. I myself make all the mounts for any bikes I have made, I have put many motors, Chainsaws, Weedeaters, random big fat B&S motors. Basically pretty much any motor can go on a bike, but you are almost always going to custom fabricate some parts or hope they are available from one of our many vendors.

Tristan do you have a welder or access to a friend or relative that does? If so then it is more than possible it will probably be fun!