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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.

The new R&D Racing Supercharger Pulley Wheel will deliver a noticeable and impressive boost in torque and overall horsepower. Designed and manufactured from high quality billet aluminum and precision hard anodized for superior belt wear resistance. The R&D Pulley is ¾ lb lighter than the O.E.M. steel pulley, and delivers 2.5 to 3.5 lbs of additional boost pressure along with 30 plus well fed ponies. The holeshot acceleration is a solid 1.5-2 boat lengths over stock with a top speed gain of 1 to 2 mph over stock. Impressive results! The R&D Pulley comes completely assembled with a new high performance bearing, all necessary hardware and installation instructions.

R&D strongly recommends the use of the R&D Powershot Fuel Tuner and R&D High Output Fuel Injectors to increase fuel flow delivery when using the R&D Supercharger Wheel. Not using the recommended R&D Powershot and R&D High Output Fuel Injector Kit with the R&D Supercharger Wheel, can result in engine damage due to a lean air fuel ratio.