upgrade of electric scooter (esc, moto, battery

[Marselius]

Hi, I bought a Kingsong e-scooter about 2 years ago and have been using it a lot. I somtimes use the scooter to get up mountain roads when I am on tripps. I have to take many breaks because the esc gets too hot. now I want to upgrade it so that it can handle all kinds of slopes with some speed and maybe get a little longer range. I had appreciated the help to find the right parts I can use. I thought I could use the motor that is on the scooter now, and put it in front, and buy a new more powerful engine (around 3kw) that I can put on the back of the scooter. 
I have looked at flippsky`s esc or vesc but do not know if they are suitable for this purpose. when it comes to the motor I need something that pulls well on the slopes, it does not have to go faster than 40-50kmph.
does anyone have any ideas about some good hub motors that might suit me, and can I use flipsky's esc / vesc or is there something else that might suit me better.
I will make the battery pack myself, and have some experience with this. my budget is around $ 600 (excluding battery pack)
thanks for all the answers!  

 

 flippsky esc/vesc: https://flipsky.net/collections/electronic-products/products/dual-fsesc6-6-based-upon-vesc6-with-aluminum-heatsink-1

 

[Marselius]

(the scooter has one 800-1000w motor)

[.....]

Sounds like a fun project! Have you considered making it 2 wheel drive? Mine doesnt do mountains and such in single wheel. I also read somewhere that sharing the load between 2 motors, is easier on the electronics. Don't underestimate how much power and traction it really takes. Its hard to save money over outright buying new, as china has really figured out how to make labor and parts cheap. Best of luck! Keep us updated with how the project is coming along.