You're scooters is designed for maximum speed limit introducing a larger motor will increase your speed and torque for climbing up hills.
Also.. mobility scooters have a maximum weight capacity that will increase your weight and could very well cause damage to the physical frame of your scooter.
Upgrading your batteries to a higher current capacity will increase your speed along with perhaps different tires.
I have not researched your particular scooter but in general, mobility scooters have speed limiters that restricts your maximum speed.
One can disable the speed limiter "Viola!" more speed.
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