1989-1993 Yamaha YFM 350 Warrior O-Ring Chain & Silver Sprocket 13/40 98L 13 Tooth Front Sprocket, 40 Tooth Rear Sprocket and 520-98L 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 1989 1990 1991 1992 1993 Yamaha YFM350 Warrior