G-WINGS 725 Drive Belts 3-Pack — Direct-Fit Replacement for Hammerhead/TrailMaster, Oil- & Heat-Resistant

These three G-WINGS 725 drive belts are a direct-fit replacement set designed for older Hammerhead 80T and TrailMaster MID XRX go-karts equipped with 6.5HP engines and 30-series torque converters.

If you maintain a Hammerhead 80T or TrailMaster MID go-kart, the correct belt size matters for smooth power transfer and reliable operation. This 3-pack of 725 belts replaces part number 9.100.018-725 and is built to withstand heat, oil exposure, and the repeated flexing a torque-converter system demands. Use these when your driver and driven pulleys measure between 6 5/8" and 6 11/16"—and note that the MID series uses two belt lengths (725 and the shorter 669) so choose the one that matches your stamped belt.

How will these 725 belts affect acceleration and throttle response?

Installing the correct 725 belt keeps the torque converter operating in its intended ratio range, which preserves predictable acceleration and consistent throttle response. Worn or incorrect-length belts can slip or change engagement points, causing hesitation or reduced performance.

• Maintains designed torque-converter engagement characteristics
• Reduces slippage under load for steadier throttle feel
• Reinforced construction for consistent power transfer

Are these belts durable enough for regular trail and track use?

Yes — these G-WINGS belts are made with reinforced materials formulated to resist oil, heat, and lateral forces that occur in go-kart drive systems. That construction improves longevity compared with generic belts, especially in stop-and-go or hill-climb conditions.

• Oil-resistant compound reduces degradation around the engine area
• Heat-tolerant materials prevent premature hardening or cracking
• Excellent flexibility helps withstand repeated tension cycles

How do I confirm the 725 is the right size for my kart?

Measure the existing belt or measure the pulley diameters to verify compatibility: the 725 is intended for driver and driven pulleys between 6 5/8" and 6 11/16". The TrailMaster MID series commonly uses both 725 and 669 belts — the 669 is about 1/2" shorter than the 725.

• Check the belt stamp: 725 printed on the belt equals this set
• Measure pulley diameters to confirm the 30-series fit range
• Replace in sets when multiple belts are worn for balanced drive

What does this 3-piece set include and which part numbers it replaces?

This listing supplies three identical G-WINGS 725 drive belts intended to replace OEM part number 9.100.018-725. Supplying three belts makes it convenient for owners who service multiple karts or like to carry a spare for quick roadside swaps.

• Three G-WINGS 725 drive belts per package
• Direct replacement for 9.100.018-725
• Designed for Hammerhead 80T and TrailMaster MID XRX equipped with 6.5HP

Who is this for? These G-WINGS 725 belts are intended for owners and technicians of older Hammerhead 80T and TrailMaster MID XRX go-karts with 6.5HP engines and 30-series torque converters who need a reliable replacement belt built for oil and heat exposure. Choose this 3-pack if your kart’s existing belt is stamped 725, your pulley diameters fall within the specified range, or you want spare belts on hand for maintenance, trail repairs, or small shop inventory.