1999-2003 Yamaha YFM350 350 Warrior Green Chain & Silver Sprocket 14/40 14 Tooth Front Sprocket, 40 Tooth Rear Sprocket and 520-98L Green Non-O-Ring Chain All Race-Driven sprockets meet or exceed OEM specifications and use hardened S45C steel. Non-O-Ring chain doesn't have o-rings between the links so it is lighter, thinner and has less drag. Fits 1999 2000 2001 2002 2003 Yamaha YFM350 Warrior