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Go and buy one of those cheep a$$ stethoscope at the auto parts store, and probe around and see what you find. If you dont want to spring for a stethoscope, use a long shaft screwdrivers, and put the handle to your ear, and carefully touch the other end to different parts of the engine until you pin point the sound. Then post back and let us know what you found.
OH and on the buggered threads, just buy a Heli-Coil kit in that size, and it will never happen again.
My ultra sometimes has a noise from the jiffy stand when it's in a certain position.
While running I've had noise from my belt tip hitting the tank,
the speedo driver on my ultra, just before it broke,
the clip on the quick disconnect windshield not being clipped right and rattling,
and those damn playing cards I clipped to the fender with a clothes pin,so the spokes make it sound like a real motorcycle[:@]
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