Replacement Part Number: 9.110.018, 9.100.018, 725. Before purchasing, please check the details to ensure this part is compatible with your equipment. Fits replacement for Hammerhead 80T and TrailMaster Mid XRX Mud Head go karts with a 6.5hp engine. This 725 torque converter asymmetrical drive belt is also used on many kit models as well as Trailmaster and Hammerhead mid karts. Driver and driven pulley must measure between 6 5/8 inch and 6 11/16 inch. Over time, belts may become loose or break due to wear. This product offers excellent wear resistance and corrosion resistance, making it a reliable replacement option for the original belt. High-performance 725 torque converter asymmetrical drive belt constructed from high-quality rubber material. Durable and built to last, featuring excellent wear resistance and corrosion resistance.