Of course! That is why one had a #54 and the other had a #58.
Although I believe these two mopeds originally came from the same owner, one has a local bike shop sticker and the other does not, indicating that they may not have been purchased at the same shop. One may have known to change the jet while the other did not.
I also find it suspicious that the air boxes have stickers with part #'s and USA printed on them. I would kill for a look at a european intake tract.
When you mention removable restrictions on jap bikes, what are you refering to? I understand european "learner" bikes use somethin easy to defeat but I do not know what this is either.
By the way, only one Motobecane came with an tire pump so I shortened a standard bicycle pump tonight. If anyone is interested, just ask.