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R&D Ultra 250 Waste Gate Block-Off Kit
R&D Ultra 250 Waste Gate Block-Off Kit
Our Price: $26.20

The new R&D Waste Gate Block-Off kit is designed to block-off the inconsistent OEM waste gate. The cnc machined part allows the supercharger to deliver its boost without premature pressure loss from a leaking waste gate. Kit comes complete with gaskets and hardware.
Kawasaki  ULTRA 250 supercharger TEMPERATURE INTERFACER
Kawasaki ULTRA 250 supercharger TEMPERATURE INTERFACER
Our Price: $64.95

R&D Performance offers a unique supercharger air temp sensor interfacer which will be necessary on Ultra 250X units with the Stage 3 Engine Kit. The added boost pressure of the R&D 1.05 to 1 and 1.1 to 1 pulley will bring along elevated intake temperatures which can be defused or lowered back down to safe temperatures with the R&D Intercooler Upgrade Kit. However, the air temp sensor is located between the supercharger and the intercooler therefore transmitting a temperature rating that is higher than what is actually entering the engine. The R&D sensor interfacer will keep the engine out of “limp home mode” during a race moto. There have been some Ultra 250X models that will default into “limp home mode” if the charger temperature sensor is peaked prematurely. Any Ultra 250 which has this default occur on long rides on hot (115 degree) days should install the R&D Supercharger Temp Interfacer Kit. The Interfacer is an inexpensive fix for this randomly occurring problem.
Ultra 250 Surge and Blowoff Valve Air Filter Kit
Ultra 250 Surge and Blowoff Valve Air Filter Kit
Our Price: $65.05

R&D Performance offers a two part High Performance Surge and Blowoff Valve Air Filter Kit which will reduce the engines intake air temperature promoting stronger acceleration and mid range performance as well as better top speed averages. The O.E.M. Surge Protection device recycles wasted off hot air back into the O.E.M. air plenum box whenever there is off and on throttle operations. In aggressive recreational or closed course riding styles, this can promote sluggish acceleration from turn to turn due to the recycled hot air. The R&D Surge Blowoff Filter Kit cycles the hot wasted off air to the back of the hull allowing it to vent out via the rear air vents. The R&D Filter Kit comes complete with 2 port plugs to seal off the blowoff valves return ports on the O.E.M. air plenum box and allowing the recycling hoses to be removed for a great high performance look.
Ultra 250X Supercharger Belt Tensioner Wheel
Ultra 250X Supercharger Belt Tensioner Wheel
Our Price: $79.75

R&D has significantly improved the Kawasaki Ultra 250’s serpentine belt tensioning wheel system by redesigning and precision machining a new tensioner wheel with a larger O.D. The new R&D Tensioner Wheel offers a wider adjustment range and helps to reduce belt slippage via more surface area for belt contact. Less belt slippage with less belt tension reduces heat and promotes supercharger bearing life! The R&D Tensioner Wheel also offers a perfect adjustment range when installing an R&D Supercharger Wheel. Better adjustment promotes less belt slippage which will add a boost in power. Wheel comes complete with precision bearing installed.
Ultra 250X Belt Holder Kit
Ultra 250X Belt Holder Kit
Our Price: $80.40
Out of Stock!

Ultra 250X Supercharger Wheel Hub Kit
Ultra 250X Supercharger Wheel Hub Kit
Our Price: $83.95

The R&D Ultra 250 Billet Supercharger Wheel Hub Kit was designed and developed while testing the R&D Supercharger 1 to 1 Booster Wheel Kit. The R&D Billet Supercharger Hub Kit will replace the O.E.M.’s vulnerable part with a redesigned and beefed up precision CNC Machined 6061 billet aluminum part that is much stronger than stock. The new R&D design also offers pulley wheel alignment adjustments with a CNC machined Shim Kit that allows for precision serpentine belt cog alignment. The R&D kit comes complete with a special tool that will indicate the perfect alignment of the crank drive and compressor pulleys. At 8,000 RPM, horsepower and belt life can be greatly sacrificed through misaligned pulleys! The R&D Kit offers superior strength, precision pulley alignment, and extended serpentine belt life. This all adds up to a powerful gain.
BLOWOFF VALVE PRESSURE ADJUSTING KIT
BLOWOFF VALVE PRESSURE ADJUSTING KIT
Our Price: $104.95

The R&D Kawasaki Ultra 250X Blowoff Valve Pressure Adjustor Kit is just what the doctor ordered for keeping the Ultra 250X’s boost pressure properly adjusted for peak performance. The O.E.M. Kawasaki blowoff valves pressure has an O.E.M. specification setting of 10 P.S.I. After the recommended break-in period has been performed or after 10-20 hours, if poor performance and low peak RPM’s are noticed, use the R&D Blowoff Valve Pressure Adjustor Kit to check and properly adjust the valves blowoff pressure. Some O.E.M. valve settings blowoff prematurely, leaking off and robbing valuable horsepower with low 6-8 P.S.I. settings. The R&D Kit is a necessary tool kit to readjust the blowoff valves pressure settings when using R&D Booster Wheel Pulley Kits. The R&D Blowoff Valve Pressure Adjustor Kit has helped many top dealers service departments reset the O.E.M. valve system to O.E.M. valve specifications to keep the Ultra 250X performing properly.
INTERCOOLER COOLING KIT
ULTRA 250X Intercooler Cooling Kit
Our Price: $209.95

The R&D Ultra 250 Intercooler Temperature Control system was developed to offer an inexpensive complete bolt on kit that will allow the full performance and cooling potential the O.E.M. intercooler has to offer for recreational applications. Intercooler core water temperatures have a range of affect on the supercharged air temperatures that enter into the engine. The Kawasaki Ultra 250 Intercooler operates on a dual line entrance mixture of lake temperature water and hot (140 degree) engine water that enters from the exhaust manifold to the top of the intercooler. R&D has found that bypassing the hot engine cooling water directly outward, and adding an additional intercooler cooling line, there can be a substantial and noticeable increase in low end and midrange power along with reduced detonation. The R&D Intercooler Temperature Control Kit also includes an industry first intercooler pressure relief blowoff valve to keep internal water pressures down to safe O.E.M. pressure ranges. R&D offers a range of machined flow control fittings to allow water volume control tuning for intercooler temperature adjustments for warm lake water and extreme hot air conditions. R&D offers an additional pressure relief blowoff valve kit for high water volume flow rates on higher boost Performer and Stage 1 engine kits. The R&D Kit will allow temperature tuning that will deliver surprising results. Why upgrade to aftermarket intercooler kits when there is more performance and power potential hidden in the stock intercooler system?
Ultra 250 Billet Blowoff Valve Kit
Ultra 250 Billet Blowoff Valve Kit
Our Price: $299.95

The R&D Billet Blowoff valve is a direct bolt on system that allows for precision blowoff pressure adjustments. Adjustable range is 5-21 lbs. Comes complete with B.O.V. filter, gasket, and mounting hardware.