Are you riding by construction sites with bare legs?
you must be a cutie...
ok, I'll actually try to help, even tho your somewhat vague question invites rumination on the possible source of said whistling....
some helmets whistle, and the stock exhaust system can make a whistling sound at times.
give us another clue?
Simo, when you ditch that airbox for a couple of K&N filters, that whistling sound will be gone & you'll think you've got a shop vac under your arse... :roflmoa2:
Scared the begeezers out of myself the first time I hit 4000rpm after my airbox mods.
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