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The 4 Strokes are new and almost competitive (the honda and Yamaha are now running top qualifying times at 3 dif tracks), and the reason for the 4 stroke change is because the manufacturers agree there is more room for improvement (230 HP!!! a more broad torque range!!! In the past few years the main reason for increasing lap race times were the improvement in tires and a little improvement in throttle response.
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