From a Facebook user and AI
The Bombardier 50cc motorbike 1972, was a small, two-stroke, 3 (maybe 4) gears on the right side and the rear brake on the left side, head light made in France.. Here the gears case was removed. (https://museebombardier.com/en/artefacts/bombardier-bantam-trail-motorcycle/).
Photo Pinterest https://au.pinterest.com/pin/268316090278202747/