Project: Help powering a 250w motor?

I'm trying to rig a 250w36v brushless hub DC motor to a Li-ion pack I have, but besides the standardish Blue, Green, and Yellow pins used to originally connect it to the motor controller, there is also a 6 slotted multicolored connector. 3*2 formation, with one of each red, blue, green, yellow, black, and white, all wires considerably thinner than the other 3 wires with which I am more familiar. Any clue what these are? It appears there isn't a ton of standardizing in the area and no amount of googling yielded results. I doubt it's for a readout, the scooter from which the motor came was relatively barebones on the feedback department. Any help much appreciated

Since it is attached to the motor controller, I would assume it would be for manipulating the motor speed. What does it look like? like this? , http://bit.ly/2hrFxSX

On a scooter motor you might be looking at hall sensors.

Is there a cover on the back of the motor that can be removed?

Almost. There is an identical one to the picture you linked coming out of the actual controller box, but the one coming from the motor is visually mostly identical to the hall sensor connector in this image, barring an extra white cord compared to the 5 in all the hall sensor connectors I see. Motor speed would make sense, could it be the shown throttle and something else?

Hall sensor would make sense, it's the only other cord coming out of the motor, but I am trepidatious to say for certain, due to 6 wires as opposed to the 5 I've seen out of other hall sensors. That being said, I learned of the term from your reply, and 5 minutes of subsequent googling, so are you aware of any method to find out if it is, in fact, a hall sensor? There is a plate that I imagine can be removed, but it'd require a lot of brute force as well as the 5 hex bolts, and I haven't been confident enough to do so without the looming possibility of ruining everything. Should I?

I can't provide useful advice on disassembling the motor.

Probing the wires without the proper equipment will entail significant risk. I would start by using a current limited power supply set to 10ma or so, apply power to the red/black pair starting at 5V. Observe the power supply voltage with an oscilloscope when you turn the power supply on and see if there is a capacitor being charged inside the motor. If so, turn the motor and see if you get digital outputs on the other wires. Be aware that even with this procedure it is possible that you could destroy whatever that cable is connected to.

Do you have any source information on the motor (new/used, was it removed from a particular scooter, vendor info)? Is there any manufacturer's information on the motor?

I can't attest to its age or use, but it's relatively shiny and was removed from a Citybug 2.0 scooter. I still have the original controller as well, but with my minimal knowledge, I can't quite surmise much from looking at it. More wires than colors in the rainbow. I've scoured the internet looking for info on what motors they use just so I can potentially get some data from a manufacturer but there is almost nothing out there that I've seen. Plus, Citybug has no intent on being helpful in this matter, as I have probably voided their warranty 7x over. Just googling "250w brushless motor" yields more results than one could reasonably sift through and the several links that I did search through were fruitless. Curses.