This is probably the new 450 MX bike they have coming out that will powered by Yamaha. A deal they inked just a few months ago. Very fast production if true.
According to an "inside" source at Aprillia, the 4-stroke Aprillia Off-Road and MX bikes will have Aprilia specific motors, manufactured for them by Rotax (like the Mille series)
Have to say its the off road bike(s) that have been rumored for a while. Hope they can shake up that world as good as they did with their street bikes.
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