RK Vortex O-Ring Alu QA Chain and Sprocket Kit for YAM YZF600R 94-07 RK Chain Model: 520XSO-108 RK Chain Type: Gun Metal O-Ring Vortex Front Sprocket: Steel 14 Tooth Vortex Rear Sprocket: Aluminum 47 Tooth Bike's Stock Gearing: 15-47