The AMP Moto RR produces a peak power of 33.5 hp and 66.3 lb-ft of torque. At just 275 pounds, it boasts a power-to-weight ratio that surpasses most 450cc dirt bikes. And for $3,250, it could be yours ...

motor that generates 42 horsepower and 485 lb ft (660 Nm) of torque. It boasts a power-to-weight ratio that’s heaps better than comparable 250cc dirt bikes, thanks to its sub-220-pound (100-kg ...