When I inserted the pulley on the motor shaft, there was some little side mouvement. It was not extremely major but I found this simple solution that could of fix this problem fast and it was free.
This sort of slack was due to me machining of the motor shaft. The “D” slot ( D-bore) was the problem.
The solution was to make a shim to go between the shaft and the belt pulley to prevent the mouvement.
The coke can makes perfect shim. It measure 0.0035″ ( 0.09mm)
Very easy to cut and make the shape you want.
Making a triangle helps to insert the shim under the belt pulley.
With this solution, I was able to remove the slack in the belt pulley and the shaft. After a couple of hours on the scooter, I saw the shim disintegrated or simply not there when I remove the pulley from the shaft. It does work for a certain amount of time. The shim took the same colours has the shaft and was extremelly hard to see.
The first time I did not see it and the second time I removed the pulley from the shaft, it was there but hard to see.
Electric scooter
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brushless, can, can shim, coca cola, coca cola shim, coke, coke sim, Electric scooter, jiggle, making shim, scooter, shaft, shim, shims
Here is my project about my electric scooter.
I was always interested to build a electric moving thing. In may 2009, I when in France to see familly and one of my dad and my mom best friend. His son had this electric scooter that he was not using anymore and he did not have the battery. I told him that I wanted to modify one to make it go real fast. He then gave it to me for FREE! 
A big thanks to Paulo!
I will explain how I modify this scooter and all my experimentation about it.
Can’t wait to ride it!
Jerome
Here is the weight between motors.
The brushless motor weight only 406grams compare to the 1Kg of the original motor.
It is hard to believe that a motor half the weight is 14 time more powerfull. Time will tell…
Here are my motors, the big one is the original motor. It is a 100W 24V DC.
The other small motor is a 1440W brushless motor. The maximum voltage is 36V.
1hp = 746W
so this 1440W motor = to 1.93hp
1440W divided by 746W = 1.93hp
I will round it to 2hp 
DC motor are easy to control. You plug it to a battery and it turns. Brushless motor need a special controller that send a specific pattern to the motor.
I will post about that later on.
Here is my project about my electric scooter.
I was always interested to build a electric moving thing. In may 2009, I when in France to see familly and one of my dad and my mom best friend. His son had this electric scooter that he was not using anymore and he did not have the battery. I told him that I wanted to modify one to make it go real fast. He then gave it to me for FREE! 
A big thanks to Paulo!
I will explain how I modify this scooter and all my experimentation about it.
Can’t wait to ride it!
Jerome
Here is the picture of the weight of that scooter
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Very easy to cut and make the shape you want.
Themocracy