The tiny thumper that powers the little beasts gets a rethought top end this year, thanks in part to new Euro 5 emissions regulations. Aprilia says it raised the intake to feed air more directly to the all-new head, which sports revised cams and a new combustion chamber. The exhaust is also entirely new, featuring a new catalytic converter and muffler. The result is a wider torque curve and peak power lower down the rev range. No more wringing your 125′s neck to get it moving.