I saw it many years ago and would place it in the early 70's. It involves a tween age boy and girl who start a relationship.
I remember them meeting in an arcade type of place. The boy drove a small motorbike. I think the name of the movie was Ein Karls* - somehting, or something like that, althoguh it wasn't German. I'd saw Swedish? Norwegian? Danish maybe? Althoguh the film had no nudity, it was quite openly suggestive and I'm sure quite risky for the time.
Near the end of the movie the young girl goes to visit the boy at his parents country home. The boy picks her up at the trian station on his motorbike.
I wish I could remember more, but I remember it was a touching and realistic film and I'd like to see it again.