RE: 2 stroke or 4 stroke?
A saito .72 has the same mounting demensions as a saito .56. The .82 (I believe) has the same footprint as the .100. I doubt you could get the .82 in, but the .72 would probably fit nicely. I installed a .72 in my contender which also is a very tight fit, and it went in perfectly. Plenty of power, as well!