RK Racing Chain 2002-988Z Silver Aluminum Rear Sprocket and 420MXZ Chain Race Kit Fits: Kawasaki KX80/KX85 98-13 Race kit contains: 14 tooth chromoly front sprocket; 51 tooth silver 7075 T6 aluminum rear sprocket; and RK 420MXZ-120 link chain 420MXZ racing chains are the strongest in their class giving you the best value-performance rating of any MX racing chain in the world today These lightweight mini-works racing chains were developed from the same advanced alloy material and manufacturing technology as 520MXZ MXZ chains feature Chromoly steel construction with seamless rollers and bushings, and oversized special alloy pins for added strength