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Athena 295cc 72mm Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999-2026 Chamber selection:AY21 - 21cc (95+ octane) IT175 IT250 IT465 *send a Chamber selection:H13 - 6.7cc stock compression YZ125 CR125R9300 Yamaha YZ85 Phathead cylinder

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4.4 SKU 35635525653

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Description

Athena 295cc 72mm Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999 2026 Chamber selection:AY21 21cc (95+ octane) IT175 IT250 IT465 *send a Chamber selection:H13 6.7cc stock compression YZ125 CR125R9300 Yamaha YZ85 Phathead cylinder IT175 IT250 IT465 *send a message 7cc (100+ octane)

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