It is the bother of the J AF, being identical in all but the AF facility of the J AF, as it uses Yashica's classic 32mm f3.5 fixed lens. Although it's a fixed lens, there is a switch below it which allows close focus for portrait work by shifting its position slightly, unlike some other Yashica models in which an additional element is placed in front of the lens.
The flash is selectable but all other operations are automated. It actually delivers images which are sharp, with great contrast whether using ambient or flash light.
From a quick peek at my list, there are a number of "Motor" models, and all seem to be P&S cameras. That brings up some questions about what exactly the name 'Motor' means, and why there doesn't appear to be anything similarly named in the SLR or other camera lines. I would assume the name might refer to a motorized transport, ala 'winder' like, but is there something peculiar about them that doesn't appear in any non-Motor cameras?
What I have from the list...
Yashica Autofocus Motor, Yashica Autofocus Motor (Transparent), Yashica Autofocus Motor D, Yashica Auto Focus Motor-II [HK], Yashica Auto Focus Motor-IID [HK], Yashica Motor-J & Motor-J D, and Yashica MG-Motor.
I have this camera in my "Brazil" list also. It's a shame that I did not grab all the relevant Yashica do Brazil web pages nearly two decades ago. While not containing masses of information about the models produced at the Brazilian factory, at least it was a record of those models it did produce!
I can only add two more cameras to your list Lumi .... the MF Motor (1988), and a version of the MG-Motor called the MG-Motor Direct Flash (1995) .... both Brazilian models. The MG-Motor Direct Flash appeared as two versions ... one with a switch near the lens and one without.