Green O-Ring Chain & Silver Sprocket 12/40 98L 1997-2000 Yamaha YFM 350 Warrior 12 Tooth Front Sprocket, 40 Tooth Rear Sprocket and 520-98L Green 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 1997 1998 1999 2000 Yamaha YFM350 Warrior