It spins much much faster than my sepex motor does unloaded, but series wound motors do that because of built in field weakening (something most DIY EVers take for granted!). And it spins backwards. Since it only has two power studs, this will require rewiring some of the internals to reverse the polarity between the armature and field.
Another concern is the tiny internal splines on the drive end. Check out how tiny they are:
Today I completely disassembled the motor:
Here are the stator windings and armature:
And here is what happened when I found some Cat yellow paint laying around: