Located in Salt Lake City, Utah, they built a novel-design, 4-stroke engine with 2 cylinders giving 33 hp at 5,500 rpm. It had a pressurized crankcase, like those of 2-stroke engines, to produce a small overfeeding of about 6 to 8 psi.

-It is the model O-500-L and was presented at the Sun and Fun and Oshkosh 1985 contests.