The torque is best upgraded to 1500RPM to add overall better performance to allow correct gear ratio. The weights in combo with torque sring will help tune your CVT for best take and hill climbing.
While you slow your scooter down for turns, stop and take off the rear torque springs adds in getting your engine rpms up to kick in variator to engage belt to get your scooter back up to speed.
TGB uses the GY6 50 size. Springs come in many different colors according to brand.