Aeromachi?Motor looks like those Radial finned heads on those old two stroke Harleys.
These were made in UK by Wassell. They used Sachs 125 6 speed engines. They were imported to U.S. by Mitsubishi, and ultimately sold in crate direct to consumer at closeout prices (like the ad above) by C.O.M.B. aka Closeout Merchandise Buyers from Minneapolis. They were never competitive in U.S. motocross even at local level, obsoleted by the arrival of much better performing and reliable 125‘s from Japan.