Replacement Part Number: 9.110.018, 9.100.018, 725. Before purchasing, please check the details to ensure compatibility. Fits 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 kits, including 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 loosen or break due to wear. This replacement belt is designed for durability with resistance to wear and corrosion, providing a reliable option for replacing the original belt. High-performance 725 torque converter asymmetrical drive belt constructed from high-quality rubber material. Built to be sturdy and long-lasting, it offers excellent wear and corrosion resistance for consistent performance.