I was wanting to now what kind of four-wheeler would be best to put a 750 motorcycle engine in. I want a sport four-wheeler with plenty of room for a big motor and not hard or expensive to buy?

 

blstrpro,
I think the Quadzilla would be a perzect chassis for that kind of swap, she is large enough to hold the motor with out major cutting, and there should be plenty of room to custom fab new motor mounts. The honda 250 r or LT 250r might also work and there are a little smaller if you ride in tight woods. My Zilla is large but I can rip through the woods and pretty much put her where I want her. Be sure to enlist the help of a good fab and welding shop and please send a pic when your done, I built my Latest Zilla myself and she is pretty trick I had Ct build me an awesome 500 motor but i would love to try something bigger myself so good luck. See ya in the woods

 

Read this article.

http://www.off-road.com/atv/MonsterZilla.htm