03-21 Yamaha YZ 250 72mm 300cc Athena Big Bore Cylinder Crank Motor Rebuild Kit

Athena 72mm Complete 300cc Big Bore Motor Rebuild Kit! This is the best and most reliable rebuild 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.

72mm 300cc Nikasil Athena Big Bore Cylinder. Athena 72mm Coated Piston Kit (Includes, Piston, Pin, Rings & Clips).

Hotrods Heavy Duty Crank Shaft. Hotrods Heavy Duty Main Bearings. Bottom End Oil Seals Kit.

This is a bolt on kit.

---