Engine: The RS 660 Twin, Optimized for Midrange Punch

105 hp from 659 cc—the Tuono 660 Factory uses the same engine as the RS 660, but with different gearing. Aprilia shortened the final-drive ratio by six percent compared with the RS, giving the naked bike noticeably stronger acceleration in the lower half of the rev range. The RS 660 has a well-known dip in power around 6,000 rpm; in the Tuono, it is considerably less pronounced. The result is an engine that feels more linear and more usable in everyday riding than its superbike counterpart—and smoother to ride on backroxymi

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