wow, what a POS
those are original JPXs - notice the exhaust comes out the "bottom" of the engine as viewed as the carb being on top in a normal lazair install. same carb though, and the old original fuel pump on the front (ultraflight went away from these).
on mine the exhaust and intake are on the same side of the engine. i have 2 JPXs like these and you can't flip the cylinders due to porting so they are my reserve experimental engines.
what a crappy looking airplane though - i think they copied the lazair