Engine: 47 hp—the legal maximum, put to good use

The RS 457’s parallel twin is an entirely new engine—and is of Aprilia’s own design rather than being sourced from another manufacturer. It displaces 457 cc, is liquid-cooled, uses dual overhead camshafts, and features a 270-degree crankpin offset. That offset is crucial to the engine’s character: it creates uneven firing intervals that give the motor a slightly rough-edged, distinctive exhaust note—far removed from the sterile drone of some parallel twins. For an A2 motorcycle, that genuinely sets it apart.

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