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 kit models, 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 offers excellent wear and corrosion resistance, providing a durable alternative to the original. High-performance 725 torque converter asymmetrical drive belt constructed from premium rubber material for durability and long service life. Designed for reliable performance and resistance to wear and corrosion.