My RX4 is smooth up up 6000 rpm then gets a little buzz around 6500 and is smooth again at 7000 and up. Not enough for me to feel and does not badly distort the mirrors. I would not have even noticed it, except that I hear a slight vibration in the aluminum skid plate. When I go back and ride my old RX3 it sure feels light weight and under powered compared to the RX4.
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