tony240z,
JLO Rockwells were used in Attex, Max, Scorpion Snowmobiles, Ultralights and probably other vehicles. The name of the engine changed over the years as the rights changed hands. Don or Mike may have more detailed info?

Here's a shot of a 2si 215 20hp with CDI, that I bought New 5 years ago. The engine beside it is a NOS JLO 400; I'm using that in my Scrambler.