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Athena 295cc 72mm Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999-2026 Chamber selection:AY21 - 21cc (95+ octane) two sets of o-rings Yamaha Chamber selection:HF21 - 17.4cc Stock compression 400EX all years CR125R9301

SKU: 35635525653
4.7
USD212.50 USD237.50 Pit lane

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Ships within 48 hours · Estimated delivery Sep 21 - Sep 26

Description

Athena 295cc 72mm Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999 2026 Chamber selection:AY21 21cc (95+ octane) two sets of o rings Yamaha Chamber selection:HF21 17.4cc Stock compression 400EX all years CR125R9301 two sets of o rings 12* chamber requires special piston

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