Due to their complexity modifying modern mobility scooters like the Shoprider Sprinter XL4 is much different than modifying basic low-tech two-wheel recreational scooters which is what our experience is based on.
If we were to make a modification recommendation it would have to be to replace the existing motor and transaxle with a go-kart axle and wheels along with a recreational electric scooter motor, controller, and throttle. This would remove the original rear wheel parking brake which is built into the motor so a go-kart brake would need to be installed on the axle and a locking handlebar brake lever installed for a parking brake.
Jason Noble