Aprilia introduced the 2021 RS 660 as a new take on the middleweight supersport category, aimed to be more practical and comfortable than the race-inspired, screaming inline-four 600s without losing the entertainment value and sportiness. In fact, it will be used as a popular platform in the MotoAmerica Twins Cup championship, proving its potential.
Described by CW Technical Editor Kevin Cameron in great detail, the RS 660 is powered by a liquid-cooled 659cc parallel-twin engine that is based upon Aprilia’s RSV4 superbike platform. The idea was to create an engine platform versatile enough to power a range of models in different segments, such as the Tuono 660 and rumored Tuareg 660 adventure bike.
As part of our in-depth testing regimen, we ran the RS 660 on our in-house Dynojet 250i dyno, recording horsepower and torque measurements. The Aprilia produced an impressive 88.81 peak horsepower at 10,450 rpm and 45.34 pound-feet of torque at 8,530 rpm. Also take note of the flat, broad torque curve, resulting in drivability at nearly any rpm. From 8,000 to 10,000 rpm, torque varies very little, while nearly 80 percent of its peak torque is available from 4,000 rpm. It’s more of a tabletop than a curve. Impressive.
The Aprilia RS 660 is a remarkable middleweight motorcycle, with a versatile and engaging engine package. It will be interesting to see how the powerplant applies to various upcoming models.