A visible difference was adding sheet metal side panels, covering a carburettor, battery and air filter.

The engine was produced by Warszawska Fabryka Motocykli (WFM) in Warsaw.

W-2A engines were produced by Metal Works Dezamet in Nowa Dęba.

[3] Also a small series of rally variant M11R, with a telescopic fork was made.

[3] In 1962 a licence were sold to Escorts Group in India, where they were produced until 2005 as Rajdoot Excel-T.[3]