QYMOTO 725 CVT Drive Belt for 30-Series Torque Converter — 3-Pack, Durable Fit for Go Karts & Mini Bikes

QYMOTO's 725 CVT drive belt is a direct-fit replacement belt designed for 30-series torque converters used on many 30cc–208cc go karts and mini bikes, sold here as a three-belt pack.

If your kart’s original belt shows wear, glazing, or slipping, the QYMOTO 725 belt offers a ready replacement compatible with a range of mid-frame karts and mini bikes. Engineered to match the dimensions and performance expectations of 30 series torque converters, this belt works with several common makes and models so you can restore drive engagement without reworking pulleys or clutch parts.

Will this belt fit my go kart or mini bike?

The QYMOTO 725 is intended for 30-series torque-converter systems and is commonly used on American Sportworks and similar karts. Check your existing belt number or compare the belt profile and length to confirm compatibility.

• Direct replacements for many 30-series torque converter kits
• Fits American Sportworks 4170 Fox Vector and 5210 Marauder models
• Works on TrailMaster and Hammerhead mid karts that call for a 725 belt
• If your old belt is marked 669, verify dimensions before swapping

How does the 725 belt perform under load?

This CVT belt is manufactured to deliver consistent power transfer across typical off-road and recreational karting conditions. It resists slipping and glazing when installed and maintained properly, providing steady acceleration and clutch engagement.

• Designed for smooth torque transfer in 30-series converters
• Durable compound reduces premature wear from heat and friction
• Stable tension helps maintain reliable acceleration and topping out
• Sold in a three-pack for quick replacement or spare parts

What vehicles and part numbers match this belt?

The QYMOTO 725 belt replaces several OEM and aftermarket part numbers and fits a range of small off-road vehicles and mini bikes. Refer to the listed replacement numbers and vehicle examples to decide if this is the correct belt for your application.

• Replacement Part Numbers: 9.110.018 and 9.100.018-725
• Common fits: TrailMaster MB200 mini bike, Hammerhead 80t, Mudhead 208r go karts
• Also fits American Sportworks 4170 Fox Vector and 5210 Marauder
• Always match belt size and profile with your old belt before ordering

How should I replace and care for the belt?

Install the new belt following the torque converter manufacturer’s instructions to avoid misalignment or improper tension. Routine inspection and cleaning extend belt life and help detect damage before failure.

• Replace in sets if multiple belts show wear—this listing includes three belts
• Inspect pulleys and clutches for grooves, debris, or misalignment
• Keep ventilation open to reduce belt overheating during extended runs
• Use the manufacturer’s torque and alignment specs for installation

Who this is for: This three-pack of QYMOTO 725 CVT drive belts is for owners, mechanics, and hobbyists who need a cost-effective, OEM-style replacement for 30-series torque converter systems. Ideal for those who service American Sportworks, TrailMaster, Hammerhead, and similar mid-frame go karts or mini bikes, it suits riders who want reliable, ready-to-install belts on hand for maintenance or quick repairs.