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300cc Big Bore Kit By Athena

This 300cc Big Bore Kit by Athena increases YZ250 displacement to 293cc. Cylinder is nickel-carbide plated with enlarged water passages for exceptional durability and performance. Bore increased to 72mm (stock is 66.4mm); stroke remains the same as stock (72mm). 15:1 compression ratio. Forged, domed piston. No case machining necessary. Kit includes cylinder, head, piston, rings, pin, clips, power valve assembly, and all required gaskets. YZ models are for closed course competition regardless of modification
  • Fits '03-'17 YZ250; '16-'17 YZ250X



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300cc Big Bore Kit By Athena
DBY-ACC56-34-48

$1,296.99
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300cc Big Bore Kit By Athena - Replacement Piston - 71.95mm
DBY-ACC56-34-49

$198.99
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300cc Big Bore Kit By Athena - Replacement Piston - 71.96mm
DBY-ACC56-34-50

$199.99
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300cc Big Bore Kit By Athena - Replacement Ring Set
DBY-ACC56-34-51

$40.49
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300cc Big Bore Kit By Athena - Replacement Gasket Set
DBY-ACC56-34-52

$21.99
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300cc Big Bore Kit By Athena
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