(I added a couple other F4s into the mix)
A four-cylinder advanced “short stroke” engine powers the entire F4 range. Piston diameters of 79 mm are combined with a stroke of 50.9 mm. The peak rev limit has been raised to 14,000 RPM for the F4 RR.
The F4 RR short-stroke inline four-cylinder is pushed to a record 200.8 hp.
The frame is comprised of two distinctive elements, developed by MV Agusta to offer the advantages of both solutions usually proposed individually. The main section of the frame, in fact, is made of CrMo steel tubes united to a pair of cast aluminum alloy plates which form a complete structure and the fulcrum point for the sculpted single-sided swingarm. The new frame has been further optimized to reduce weight without sacrificing rigidity. The F4 RR also is hand welded with TIG technology and uses a dedicated steel, with exceptional mechanical properties.
The three versions of suspension on the new model offer three distinct combinations of fork and shock while all providing the established traditional handling strengths of F4. The F4 equipment includes a 50mm diameter Marzocchi fork and Sachs shock that are both fully adjustable. F4 R utilizes a race specification Öhlins, again fully adjustable. Technological excellence and complete personalization are distilled on the F4 RR: Öhlins suspension with electronic control allows the driver to choose between different setups directly from the dashboard. As aforementioned there are specific modes of power delivery for the four cylinder engine; the pilot, however, may also adjust the suspension in a completely autonomous way from the engine maps. The system provides separate control for compression damping and rebound damping, while customizing the spring preload is manual. The electronic steering damper allows to choose between manual or automatic adjustment, in which case the response varies as a result of vehicle speed.
The top of the line F4RR goes for a cool $32,400.