JT Sprockets Steel Front Sprocket Yamaha YZ 250 1999 - 2021 YZF 400 1998 - 99 YZF 426 2000 - 2002 YZF 450 2003 - 21 Kawasaki KX 250 1999 - 2008, 13T

JT Sprockets is the world's leading manufacturer of aftermarket sprockets, constantly raising the industry's standards for quality and service. JT Steel Sprockets are manufactured using only the finest grade of SCM420 chromoly steel alloy for the front sprocket

Fitting guide: http://www.jtsprockets.com/catalogue/part/JTF565/