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My new KPX makes a noise when the bike is pulling good, but it never knocks, or rattles when you rev it. I try to listen for it in some other KPX videos, and think that I hear it as well. Its almost like when you start entering the power band, and the bike starts " coming alive". My Savage (also a single cylinder air cooled motor) made a similar noise in a similar situation, and it seemed louder when it had the windshield on it, and louder in certain helmets. It's not air noise, like you sometime get with a pod filter, but I really don't know what it is. I assume it's normal, at least hope so. The bike has did it from the get go, and now probably has around 120 miles on it.
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