Travis,
You may already be aware of this, but you may be able to convert this engine to diesel with a little work. Diesel used to be fairly popular fuel in a lot of the older RC airplane engines. There is still a bit of info out there on the airplane forums telling how to build a kit to get the compression just right. Diesel and castor fuel also smells a lot better when running.
https://www.youtube.com/watch?v=1pCgOL6zRqQ