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Might sound silly but I took my bike into the dealer yesterday for the same reason.
I have about 8700 miles on the tires.
the tech, after he took it for a ride showed me that the tires were cupping on the left side causing the problem.
Another high pitch noise can be a final drive belt not properly aligned to the final drive sprocket. This will happen more as the bike gets up to temp.
I dont see where you listed your model, but in the event its a touring, Ill throw this at it;
Broken rear exhaust support bracket right above the starter motor, towards the left side.
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Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
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Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
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