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I owe you an apology Austin. You are right and, in fact, I remember being a bit puzzled when I first read that myself. The Haynes manual makes no mention of it. If the two disagree, I would tend to believe the factory manual, but in this case not. I reckon it must be a way of preventing a vacuum in the cam cover, in the same way that it recommends removing the oil filler cap. I haven't done this on any other bike and I think I will be ignoring it with this one.
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