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Chamber selection: 1999-2022 Y20 - 22cc Stock compression for the X model Y21 - 21.1cc Stock (91+ octane) Y22 - 20.1cc (100+ octane) Y23 - 19.1cc (105+ octane) 1999-2022 big bore chambers: YZ295 - 24.8cc 72mm 93 octane - Revised squish clearance .055" YZ296 - 24cc 72mm 100 octane - Revised squish clearance .055" 1988-1998 Y30 - stock Y31 - (95+ octane) Y32 - (100+ octane) Y33 - (105+ octane)
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🇺🇸 Ship from USA · On Agora since 2026
$80.00