hello

similar to this. but 36/18. i will try to figure out what motor is in there.
 

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Okay, maybe it's a Bafang G310, anyways, do you know what motor you have?
Looks almost the same and likely is interchangeable with this Bafang. Mine likely is priopetary to A2B but don't know for sure. I did find a long 20ish digit number on the outside of the hub. finding no references to that on any website.
 
Is there any manufacture written on the motor?
no manufacturer's name. this is the long number SY1236200D0639PS1W . There is a number on the inside of the hub on the motor parts that looks to be 714C218 although the ink stamping is a little blurred. interestingly, there is an SY molded into the casting on the hub.
 
You probably have a Shengyi motor.

SY = Shengyi
12 = probably the model #, SY12 motor
36 = Rated for 36V, doesn't necessarily you can't go higher
200D = 200W, and it a D motor not DC. D means freewheel and DC means cassette for Bafang, however I don't know if it's the same with Shengyi.
06 = 06T winding

Shengyi motor usually starts with SY product number.
Wow-you are good. This Eunorau motor looks like the exact same one. Three scews holding the motor in the hub and even looks like the same pin layout in the connector cord.
 
Ok, do you have a cassette or freewheel?

Looks like you might have freewheel, but I can't tell from these pictures.

Here is one for cassette

Here is one for freewheel
Cassette.
 
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