Yamaha YZ125 combustion chambers Chamber selection:Athena144 9.8cc (91+ octane) two sets of o-rings
Description
two sets of o-rings
Y20 - 22cc Stock compression for the X model
T152 (100+ octane)
IT200 YTM225 Tri-Moto 1983
KTM250SX 2023-2025 Phathead cylinder head kit Husqvarna TC250
Yamaha YZ125 combustion chambers Chamber selection:Athena144 9.8cc (91+ octane) two sets of o-ringsChamber 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)
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