Self-contained sequence on teaching braking techniques. Could easily be the same as one of the other blue bikes. Apparemment non. Le seul indice solide est la forme anguleuse du réservoir d'essence. Qui rappelle fortement une Yamaha XS 500. Mais aussi, pourquoi pas, RD 250 ou 400? Blue colour and wire wheels means probably an RD 250 from about 1977. RD 250 C from the brake caliper
Tail section behind the seat, D model.