They are reputed to have supplied Triumph, Ariel, Matchless and Brough-Superior with engines at times too, first through H & A Dufaux England Ltd, and then, by 1912, Motosacoche Ltd (GB), with Osborne Louis De Lissa.

Motosacoche had factories in Switzerland, France and Italy, and supplied MAG engines to continental manufacturers including Clement, Condor, Imperia, Neander and Monet Goyon.

[3][4] When the Bol d'Or 24-hour event was first held on the outskirts of Paris in 1922 the winning rider covered more than 750 miles (1,210 kilometres) on a 500 cc Motosacoche.

[5] In 1928 they made a name in the Grand Prix, with the Motosacoche 350 M 35 ohc racing bike, built by Dougal Marchant of England, ridden to two European championship titles, 350 and 500, by Wal Handley.

Le Vack was killed in an accident in the Swiss Alps on 17 September 1931, while testing the Motosacoche A 50 near Bern.