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I have not ridden the Dorso. However, I have ridden the new Caponord which I believe uses the Dorso 1200 motor. Granted the Capo is much heavier than the Dorso, but I felt that the Capo ran out of revs way early. I really felt it needed at least another 4K rpm to rev because it was just making power when I hit the rev limiter. I liked everything else about the new Capo and I would have bought one if not for the lackluster motor in it. Even the Aprilia factory rep (who was hosting the Capo rides) agreed with me concerning the motor.
With that said, I do own and ride the hell out of an Aprilia Tuono. I have a limited edition, pre-production Tuono that was essentially made as a proof-of-concept for the Tuono concept before full scale production of the Tuono began. I love that bike. I haven't had a single issue with it - my Aprilia has proven to be bullet proof and I would buy another Aprilia without hesitation.
If you buy the Dorso, I definitely want to know what you think about it after riding it for a while. What else do you ride?
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The reason why the Caponord runs out of power is because it does not use the same engine as the Dorsoduro.
The Caponord gets a 1,197 cc liquid-cooled V-twin engine similar to that found in the Dorsoduro 1200.
Aprilia says the engine and electronics are tuned for more mid-range power, which is aided by including 52 mm throttle bodies instead of the 57 mm ones found in the Dorso.
The Caponord makes a (claimed) 125 horsepower at 8,250 rpm and 84.6 foot-pounds of torque at 6,800 rpm wile the Dorsoduro makes 85lb-ft in its mid-range at 7,200rpm, while peak power of 130bhp arrives at 8,700rpm.