WEBAprilia parallel twin, Four strake, liquid-coaled, double overhead camshafts (DOHC), Four valves per cylinder. 659 79 HP (59M) at 9,250 rpm 51 Ft-lbs (70 Nm) at 6,500 rpm Steel tube trellis with aluminum bracket Airbox with head-on intake, 2 - 48mm throttle body, Ride-by-Wire engine management 6 gears Kayaba 43mm USD with top out spring.