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725 Drive Belt for 30 Series Torque Converters – Comet, Juggernaut & Clone CVT
725 Replacement CVT Torque Converter Belt
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725 Drive Belt for 30 Series Torque Converters – Comet, Juggernaut & Clone CVT

Part Number: 725BLT
Online Price: $19.99
Phone Order Price:$21.99
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725 Drive Belt for 30 Series Torque Converters – Comet, Juggernaut & Clone CVT
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Description

725 Drive Belt for 30 Series Torque Converters | Fits Comet, Juggernaut & Clone CVT Systems


The 725 Size Drive Belt is a premium replacement belt engineered for 30 and 340 Series Torque Converters, including Comet, Juggernaut, and Comet-style clone CVT systems. This asymmetric belt features a 3/4" top width and 27.5" length, with a flat inner side and angled outer edge—ideal for optimized power transfer and efficient engagement.


Whether you're riding a TrailMaster MB200-2 minibike, driving a Hammerhead Mudhead or 80T go-kart, or maintaining an American Sportworks vehicle, the 725 belt is the recommended upgrade or direct-fit OEM replacement for consistent, long-lasting performance.


Key Specifications:

  • Belt Size: 3/4" Width x 27.5" Length
  • Marking: 725 (stamped on belt)
  • Style: Asymmetric (flat one side, angled the other)
  • Material: High-durability compound for superior heat, wear, and load resistance
  • OEM Equivalent Part #: Comet 203590A, American Sportworks 14704, American Landmaster 14704


Compatibility:

  • Torque Converters: 30 Series / 340 Series CVT (Comet, Juggernaut, and clones)
  • Mini Bikes: TrailMaster MB200-2
    • With bearing-style driver: Recommended upgrade from 669 to 725
    • With bushing-style driver: Use 725 belt
  • Go-Karts:
    • TrailMaster Mid XRS
    • Hammerhead Mudhead & 80T
    • American Sportworks 4170 Fox Vector, 5210 Marauder
  • Aftermarket TAV Kits: 218352AM


Why Choose the 725 Drive Belt?

  • Precise Fit for CVT Systems – Ensures tight, secure engagement without slippage
  • Enhanced Performance – Optimized for torque transfer under load
  • Built to Last – Resists heat, abrasion, and stretching in high-RPM applications
  • Proven Compatibility – Ideal for a variety of minibikes and go-karts

Here’s a comparison chart between common 30 Series torque converter belts: 669, 725, and 788. This can help you choose the right drive belt based on your specific engine setup, frame clearance, and performance needs.


30 Series Torque Converter Belt Comparison Chart

Belt Model

Top Width

Outer Circumference

Style

Common Applications

Notes

669

3/4" (0.75")

27"

Asymmetric

TrailMaster MB200 (w/ bearing-style driver), Coleman BT200X

Stock belt for many minibikes, shorter than 725, less top-end speed

725

3/4" (0.75")

27.5"

Asymmetric

TrailMaster MB200-2, Hammerhead 80T/Mudhead, American Sportworks

Slightly longer than 669; recommended for upgraded performance

788

3/4" (0.75")

30"

Asymmetric

Used in taller jackshaft setups or custom high-speed applications

Longest of the three; better for top speed but may require clutch spacing


Key Differences Explained:

  • 669 Belt:
    Standard length belt for most stock mini bikes and TAV kits. Great for low-to-mid-range torque.
  • 725 Belt:
    Slightly longer for better belt engagement and top speed. Ideal upgrade for TrailMaster MB200-2, especially with driver clearance issues.
  • 788 Belt:
    Longest option—used in custom builds, taller gearing setups, or when more clearance is needed. May require jackshaft repositioning or driver pulley adjustment.


Installation Tips:

  • Always verify belt alignment and pulley spacing to avoid premature wear.
  • Replace worn or stretched belts early to maintain consistent CVT engagement.
  • Match belt length and style (asymmetric) to your torque converter type.


Keep Your Torque Converter Running Strong

Don’t settle for a stretched or slipping belt—upgrade or replace your CVT belt with the trusted 725 series to maintain smooth acceleration, efficient power delivery, and extended driveline life.

FAQ

What is the 725 belt used for?

The 725 drive belt is used in 30 Series torque converters, including Comet, Juggernaut, and their Chinese clone CVTs. It's commonly installed on go-karts, minibikes, and small utility vehicles like the TrailMaster MB200-2, Hammerhead Mudhead, and American Sportworks models.


What are the dimensions of the 725 belt?

  • Top Width: 3/4 inch (0.75")
  • Length (Outer Circumference): 27.5 inches
  • Style: Asymmetric (flat on one side, angled on the other)


How does the 725 belt compare to the 669 belt?

The 725 is slightly longer than the 669 (27.5" vs. 27"). It allows for smoother CVT operation, slightly more top-end speed, and better engagement in some upgraded or modified drivetrains. It's a common upgrade for the TrailMaster MB200-2 and similar setups.


Will this belt fit my TrailMaster MB200-2 mini bike?

Yes. The 725 belt is the recommended belt for TrailMaster MB200-2 models.

  • If your engine has a bearing-style driver, you can upgrade from the stock 669 belt to the 725 for better performance.
  • If it has a bushing-style driver, the 725 belt is typically required.


Is the 725 belt heat-resistant?

Yes, the 725 is made from high-durability, heat-resistant materials. It's designed to withstand extended high-RPM use and maintain reliable performance under load.


Can this belt replace Comet 203590A?

Yes, the 725 is a direct replacement for Comet 203590A, as well as American Sportworks 14704 and American Landmaster 14704 belts.


What torque converters is this not compatible with?

The 725 belt is not compatible with:

  • 40 Series or 500 Series torque converters
  • Symmetric belts (this is an asymmetric belt, flat on one side)
  • Applications requiring significantly longer belts like the 788, unless modified


How do I know if I need a 725 belt or another size?

Check:

  • Your vehicle model and torque converter setup
  • Your current belt size (usually printed/stamped on the outer surface)
  • Clearance between driver/driven pulleys

You can also refer to our Belt Comparison Chart above for guidance.

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