RE: What gas engine to use
Silversurfer,
A converted G62 will not run against he MVVS58 any day or night, the mvvs58 will smoke it. A properly setup mvvs58 on canister swings a 26x10 @ 6000 rpm, 24x10 at 7000, it swings the 24x10 @ 6700 rpm on a Slimline wrap-around pitts DA-50 modified muffler.
The best the zenoah can do is a 22x10 @ 7200.
So no way will the zenoah 62 ever come close to the mvvs58 power, The mvvs58 with a factory canister weighs the same as the zenoah converted so its not any heavier either.
As for the reliability, price performance ratio, or any other factory, I'm not going to comment on that because I do know, however, if you wanted power readings, well their you go MVVS58 wins in this category.