Kawasaki Jet Ski Ultra 310R
Kawasaki has been the leader in building Personal Water Craft over the years and what we’ve come to expect from them hasn’t changed. However, the 2018 Jet Ski Ultra 310R, on the same platform as the 2017 Jet Ski 310X, differs little with the exception, for the handlebar clamps. We’ll get to that in a minute. Still, the 2018 Jet Ski 310R has consistent quality and maneuverability despite the few changes to this year’s model.
The engine is of course supercharged and intercooled. This 4 stroke has DOHC four valves per cylinder. That means better airflow especially at high speeds and results in better top performance. The drawback on a four valves per cylinder engine is that it’s more parts to consider when doing repairs. The 310R also has an inline 4-cylinder engine which can give you a descent amount of horse power. It is also light weight enough to keep the overall mass of the Jet Ski down.
The cooling system is inducted water and the fueling system is Direct Fuel Injection with 60mm throttle body. For those of you who may not know, the 4 stroke engine with DFI, actually has moving valves to seal the combustion chamber and control the air intake and exhaust. So in essence it’s environmentally better, but many still debate if the performance is better than a 2 stroke.
The 310R also has the TCBI with digital advance which combines rpm, throttle and atmospheric pressure to know when to advance through digital means. Kawasaki has always used (TCI) on its bikes and powersports vehicles while Honda uses (CDI). The starter is also electric. With all the new sensors and wiring on PWCs these days the electric starter is a necessity.
The propulsion system has a 160mm jet pump gives increased acceleration and performance at top speeds. The 2018 310R, additionally, has a single stage axial-flow pump. It can be adjusted at peak efficiency at low-flow/high pressure or high-flow/low pressure by a pitch change in the propeller.
The 2018 Jet Ski 310R has direct drive from the engine with semi-dry sump system. Fuel capacity for this model is at 20.6gal. Then there is the Smart Learning Operation mode, that limits the speed of the engine for new riders so they can become accustomed with the Jet Ski.
Now, what is different, on the 310 R, is the adjustable handlebar clamps that have three heights and two mount position options. Twelve different positions are available with the base package. Eighteen are possible with the accessory clamp holders. There is forward, rearward, up or down in order to adjust your riding position and get it to your optimal preference.
The curb weight of this model is 1047.4lbs and is 132.7 inches in length. It can seat three passengers and has a 56gal storage capacity. Another plus and new feature, to the 2018 Jet Ski 310R, is the seat covers. They are a textured “griper style” material seen on a Kawasaki KX 450F motorcycle. This textured seat makes the rider stay seated, especially around tight turns at high speed. It also provides lower body support during your ride.
Even though the 2018 Jet Ski 310R is not as different from the 2017 310X, both in terms of performance and safety, the new upgrades can keep the novice rider and the pro-racers pleased.
www.boats.com “DFI Direct Fuel Injection Two Stroke Outboards: The Outboard Expert” by Charles Plueddeman 2012