Scroll notes
Type firstDescription
Athena 295cc 72mm Yamaha YZ250 YZ250X WR250 Phathead cylinder head kit 1999 2026 Chamber selection:AY20 20cc (105+ octane) The material is stronger and Chamber selection:K02 6.0cc (95+ octane) 2cc StockH02 7 yz65 CR125R9304 The material is stronger and transfers heat better than cast aluminum 6cc (110+ octane)
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