Yamaha YZ250
03-22 Yamaha YZ250 YZ 250 72mm 300cc Athena Big Bore Cylinder Top End Piston Kit

Part #: (A-P400485100)
Starting from $1,249.99

Athena 72mm 300cc Big Bore Cylinder Top End Kit!

This is the best and most reliable big bore kit on the market!

Fits Yamaha YZ250 2 Stroke Dirt Bikes

 Years 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022

This kit includes:
  • 72mm 300cc Nikasil Athena Big Bore Cylinder
  • Athena 72mm Coated Piston Kit (Includes, Piston, Pin, Rings & Clips)
  • Athena Complete Top End Gasket Set
  • Athena Head
  • Athena Head Stud Kit
  • Athena Power Valves
All parts come with warranty.
We ship worldwide & ship all domestic orders free!


Price: $1,249.99

FREE STANDARD SHIPPING is available in all US lower 48 states, APO addresses, and Puerto Rico via USPS or UPS. (*Exceptions apply for Alaska and Hawaii.)
Free standard shipping means we will select an option that gets you your parts as soon as possible while still being economically priced.

*Shipments to Alaska and Hawaii are free as long as the parts will fit in a USPS Priority Mail Flat Rate box or envelope.
For any other type of shipping there will be a charge.


AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDelawareDistrict of ColumbiaFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyoming