2001-2003 Yamaha YFM350 350 Warrior Yellow O-Ring Chain & Silver Sprocket 13/40 13 Tooth Front Sprocket, 40 Tooth Rear Sprocket and 520-98L Yellow O-Ring Chain All Race-Driven sprockets meet or exceed OEM specifications and use hardened S45C steel. O-Ring Chain helps keep the pins lubricated which reduces friction and helps the chain last longer. Fits 2001 2002 2003 Yamaha YFM350 Warrior