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. Designed to fit replacement applications 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 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 loosen or break due to normal wear. This replacement belt is constructed with high-quality rubber material for enhanced durability, offering resistance to wear and corrosion. A reliable, high-performance option for replacing worn original equipment belts.