Yamaha YZ125 combustion chambers Chamber selection:Y11 - 10.0cc Stock Kit includes the required engine

Kit includes the required engine mounts

In addition to the head you will also receive a customized dog tag with the same etch that goes on the head adjusted to best fit the tag

Use the Athena Big Bore Gasket

Honda CR250 Phathead cylinder head kit 2002-2004

Yamaha YZ125 combustion chambers Chamber selection:Y11 - 10.0cc Stock Kit includes the required engineChamber selection: 2005+ FX11 8. 3cc Stock FX12 7. 8cc (95+ octane) FX13 7. 2cc (100+ octane) 1994 2004 Y11 10. 0cc Stock Y12 9. 3cc (95+ octane) Y13 8. 8cc (100+ octane) OE cylinder 144cc 58mm FX144 (91+ octane) FX145 (100+ octane) Athena 58mm 144cc 2005 2021 Athena144 9. 8cc (91+ octane) Athena145 9cc (100+ octane) Athena 58mm 144cc 2022 Present Athena144 22 9. 8cc (91+ octane) Athena145 22 9cc (100+ octane)