How good is the tork on a 4 stroke 250cc shaft driven off road go cart.. roketa gk39?

How good is the tork on a 4 stroke 250cc shaft driven off road go cart.. roketa gk39?
We have both the Gk19 and the GK39 Roketa. The torque is not tremendous, but we regularly haul two large adults up and down hills without any problems.