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I ride an '05 Bonnie. I've had it out twice in cold weather within the past month. Both times I've noticed a very strange whistling noise after I get it up to speed (50-60mph). The whistling persists until I bring the bike to a stop, and picks up again once I'm at 50-60mph. Any thoughts as to why this might be happening??

rodo (from blistery Glen Ellyn, Illinois)
 

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Mine started after I placed a New Bonneville 125 db horn...I think it's the wider mouth on the horn...check yours
 
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