Initially, the company focused on producing agricultural machinery and two-stroke moped engines based on Zündapp designs.

Casal's main market was Portugal, but it exported about 10% of its production, primarily to the UK, Netherlands, Denmark, and Sweden.

As Portugal's economic conditions improved, domestic demand for mopeds declined, leading to Casal's bankruptcy in February 2000.

Subsequent partnerships primarily included HuVo of Holland and Villa of Italy, and were focused on racing engine development.

Some enthusiasts modified these models for increased performance, using custom-built components and achieving speeds comparable to larger motorcycles.

In 1980, Jan Nijhuys set a quarter-mile record with a Casal Sparta Plompen, covering 402 meters in 15.26 seconds at 94.29 km/h.