Made for racing, the HSR-Benelli S4 Jet Ski 2010 is passionate about speed. Powered by a four-stroke, turbo-charged, OHC engine, the S4 is one of the first four-stroke stand-ups to hit the market. Constructed from high-stability infused composite fiberglass, this HSR-Benelli jet ski is versatile, durable and is ready to stand up to the fiercest wakes on the lake. Other features include electric start, hydraulic trim system, aluminum handle pole with protection pad and aluminum ride plate. HSR-Benelli.