Replacement Part Number: 9.110.018, 9.100.018, 725. Before purchasing, please check the details to ensure this part is compatible with your model. Compatible with Hammerhead 80T and TrailMaster Mid XRX Mud Head go karts equipped with a 6.5hp engine. This 725 torque converter asymmetrical drive belt is also used on various other kart models and conversion kits, including Trailmaster and Hammerhead mid-sized karts. Driver and driven pulley measurement must be between 6 5/8 inch and 6 11/16 inch. Over time, belts may become loose or break due to normal wear. This replacement belt is designed for durability and features resistance to wear and corrosion, making it 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.