As stock the Aprilia Tuono 125 is perfectly acceptable; the 14bhp, two-stroke, reed-valve motor pulls along with reasonable torque until you hit 7500rpm where the restrictor emasculates what’s left of the go. Once de-restricted (it involves cutting into the CDI box and it’s illegal on the road if you don’t have the right licence) power doubles to 28bhp, torque jumps to 17ft lb and top speed nudges the ton.