It's part of the emissions control, takes vapour and burny oily stuff out of the crankcases, Some will drop back into the cases as condensed oil and water (it's part of the milky oil syndrome) any that doesn't goes into the airbox then is burnt 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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