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  1. Air Cooled Twins Technical Talk
    I have a 2003 Bonneville. It's my first bike, so I'm not sure if this is normal or not. when I'm traveling around and above 30 mph, there's this hissing sound I can hear when applying throttle. It seems to be in the 2500-5000 rpm range, and is most apparent when accelerating, and especially...
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