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125 "whistles"

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my friend's 2010 klx125 (non-us model with stock fuel injection) whistles while its moving. it sounds like a tea kettle with boiling water. it doesnt do it when its not in motion, even if you rev the motor. but once you start going, she whistles even at low speed. its really annoying, doesnt sound normal at all. what could it be?

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its not rev related. i did some googling and discovered it was a common thing for klx250 people. there was a lot of debate over what it was and no clear answer, but they all seemed to agree it wasnt a safety issue or a mechanical hazard. 

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