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Cruising below 30 mph I hear a whistling noise comming from the front. My Sportster has two Brooklands and three mirrors but the noise does not change when I cover them. Any ideas?
If all else fails, get a passenger to hold a suitable length piece of rigid pipe with a flexy end which he can hold to his (her?) ear. Drive at the appropriate speed and let him search for the noise.
If you want to go high tech, use a laptop with a microphone (on a stick), headphones and sound recording software. The louder the sound, the closer the mike is to the source.