2009 Yamaha WaveRunner FX Cruiser SHO, Fully serviced with new wear ring and impeller. As Yamaha touted upon introducing the SHO in 2008, there’s no replacement for displacement. Yamaha’s 1.8-liter, in-line four cylinder is the largest displacement engine in the personal watercraft market. As has become almost the norm in high-performance PWC applications it features a supercharger with intercooler to give it much of its low-end punch. What it doesn’t feature, however, is sheer size. Contrary to what you might expect, the 1.8 is actually more compact than the popular MR-1 engine that previously defined Yamaha four-strokes. It also turns over at a more typical 7,500 rpm. (The MR-1, in contrast, whirled over at a feverish 10,000 rpm.)Size matters, but a look at the engine’s actual horsepower may surprise you. Although Yamaha no longer publishes horsepower per company policy, a look at EPA statistics indicates the engine is around 202 hp, far less than the 260 horses in the new Kawasaki Ultra 260X. But while it may seem outmatched on paper, its real world performance is on par with the big guns. During my test I achieved a top speed of 67.4 mph, and a 0-30mph acceleration time a fraction over two seconds.Equally important is what that engine makes possible. With the SHO, Yamaha adapted a drive-by-wire throttle, eliminating the physical cable that served as a link between the driver’s input at the throttle and the engine itself. This has allowed the craft to boast auto-like conveniences such as cruise control. Dubbed Cruise Assist by Yamaha, this rpm-based speed control can be set at any speed with the push of a handlebar-mounted button. The driver then simply fully squeezes the throttle to take fatigue and fluctuation out of the equation. Should the driver release, or even lessen pressure on the throttle, the system disengages. Once set, the speed can be bumped up or down in roughly 1 mph increments, within a range of about 10 mph.