04-2013 fits Yamaha YFZ450 YFZ 450 Blue O-Ring Chain & Black Sprocket Kit 12/40 100L
- 12 Tooth Front Sprocket, 40 Tooth Rear Sprocket and 520-100L Blue 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..