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yz400f engine noise?

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New to the forum.


My YZ400F on start up, is making this whizzing/fan sound  coming from the cam chain side of the engine. (Maybe in the Middle)


when increasing the rev's the sound gets louder.


No change in power tho. and the oil is clean.


the sound doesn't kick in at low rpm.


Any help would be most appreciated.


Many thanks 

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