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290BBK for a 2010 YZ250F

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The cylinder from 2009 has the same oem number as the 2010 and athena uses same cyl 2001-2009 at least, but they have diffrent pistons 2001-2007 and 2008-2009.

2008-2009-2010 uses same piston oem.

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I just installed a RPM Ice Cube 276 BB kit on my 2010 and Im pretty sure it is the same as the older year models.

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