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It's all part of the emissions control. The hot engine will vent a bit of vapour with oil in it, the boxes should allow the oil in the vapour to be trapped and dribble down back into the motor. The remainder gets sucked into the airbox and burnt.
It also allows the closed circuit on moisture that can allow the oil emulsion to form in the motor.
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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