This week’s bike is a 1974 350cc two-stroke triple from French manufacturer Motobecane / Motoconfort. The bikes were apparently badged as both marques, although there appears to only have been limited numbers produced due to the high purchase price when new.
The two yellow machines above were spotted at Coupes Moto Legende last month. The nearest one is a Motobecane, the other a Motoconfort.
There's a brief history of the manufacturer on wiki, and some more details about this particular machine here.