In repeated-though-informal tests - wristwatch to watercraft speedometer - the RX DI hit 60 mph in less than six seconds. No such gripes could be lodged against RX DI, which packs a wallop, albeit a smooth one, when the throttle trigger is pulled.
Throttle response was smooth, but lacked punch. The RFI system was a solid step toward emissions reductions, but it also made models equipped with it feel slightly anemic during acceleration. One Sea-Doo model, the two-seater GSX RFI retains the Rotax fuel-injection system introduced in 1998. Still another reported benefit of the system is greater fuel efficiency over carburetion. That would make the two-stroke RX DI compliant with Environmental Protection Agency emissions-reduction requirements for 2006. (A carbureted version of the RX also is available.) The mechanics of the system, air-pressure-driven injectors combined with electronic fuel-injection components and mapping to deliver precise amounts of fuel to each of 951cc engine's two cylinders are not as relevant as the outcome: up to 75-percent reduction in emissions, according to Sea-Doo literature. The watercraft, as well as one of three-seater GTX siblings, features Orbital Direct Injection. Speed and handling are highlights of the two-seater RX DI, but they are far from the whole story. Throughout the most aggressive S-turns, the ride was dry, although if you want to kick up cooling spray by leaning all the way forward and burying the watercraft's nose in a turn it can be done. Electronic variable trim, or VTS in Sea-Doo speak, certainly helps hold through turns, but once familiar with the RX DI I was able to turn confidently at relatively high speeds with the PWC trimmed up all the way. The 130-horsepower RX DI delivers that crisp agility with a hull that tracks exceptionally and doesn't skip or slide in corners. That's fast, the kind of fast on the water that could be frightening on a PWC with anything less than exceptional handling. But take 5 mph from 70 mph and you're still left with 65 mph. We all know personal watercraft speedometers lie, often to the tune of 5 mph. Idling back to the beach a few laps later, I check my peak speed on the watercraft's multi-function information center. In fact, midway through the turn, I get back on the throttle all the way and exit the corner with tired arms. Who said greed is good? A couple more seconds turns into a few more seconds, and now the buoy is too large and too close for comfort, so I drop the trim, back off the throttle a tad and pitch the RX DI into the corner, fully expecting to spin. I should be setting up for a sweeping 180-degree turn but I need a couple more seconds to get the most out of this speed run. By special dispensation, I've been given the opportunity to ride the Sea-Doo RX DI on the Friday before the event, and now I, a middle-aged missile, am rocketing toward the northernmost buoy. Two buoys, one at each end of Long Beach Marine Stadium in Southern California, define the riding area for one stop in an endless summer of Sea-Doo Demo Days weekends. Sea-Doo's RX DI holds an exceptionally pure line in corners and delivers strong and smooth acceleration.
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