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Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999-2026 Chamber selection:Y22 - 20.1cc (100+ octane) Use the Athena Big Bore CR85 big bore kit Chamber Selection:S02 - 6.4cc (95+ octane) Buy a size larger CR125R9301

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Description

Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999 2026 Chamber selection:Y22 20.1cc (100+ octane) Use the Athena Big Bore CR85 big bore kit Chamber Selection:S02 6.4cc (95+ octane) Buy a size larger CR125R9301 Use the Athena Big Bore Gasket Kit includes required engine mounts

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