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moto777

engine noise, shearing? whinning noise?

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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.

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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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