I bought all of these bikes last year, and have been cleaning and restoring the parts almost everyday for the last 2 months. I plan to have them all finished the summer.
Two of them are the MP97, and the other 3 are WZ507's. All are factory from Schwinn, and were designed especially for bicycle motors..
Sorry for the extra pictures, but you can see all of the parts hanging on the walls.
There is also two bins under the work bench with 3 motors.
Black DX model MP97 sn# is I81247
Faded maroon WZ507 sn# D87297
Black WZ507 on wall sn# J93128
Bare metal WZ507 sn# C01094
Maroon MP97 sn# E84684
I hope this helps!
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