engine noise, shearing? whinning noise?

my 2007 yz450 seems to have a shearing sound coming from the motor. it always had this noise but seems a little louder. any ideas? jetting? the bike seems to run great, new piston, rings and valves were all done at 35hrs. also fmf mega bomb headpipe.

My 06 always had those sounds. If it continues to run strong and start well and everything is in tolerance I would not worry about it.

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