This is a brand new Yamaha Raptor 250 YFM250r complete aftermarket high performance forged PISTON KIT
This is a 10.5:1 compression piston, so you can use pump gas still
74.00mm size, stock size
16 grams lighter than stock, quicker revving, and longer lasting
comes complete with rings, clips, and pin
This is by Vito's Performance
replaces oem: 1S4-11631-10-A0
fits every year: 2008 2009 2010 2011 2012 2013
Will also fit a 2013 XT250