Ultimax ATV/UTV UA Drive Belt- UA423 - UA423

The Ultimax UA423 ATV/UTV Drive Belt is a purpose-built CVT replacement belt designed for the 2009 Yamaha Grizzly and other compatible Yamaha ATV/UTV applications. Engineered with USA-made rubber compounds and Aramex® inner cord construction, the UA423 is built to deliver consistent, dependable power transfer through your variable speed drive system ride after ride. Whether you're hauling loads on the farm, navigating tight trails, or pushing your machine hard in the field, this belt is designed to hold up where lesser belts fail.

Key Features & Benefits

• USA-Made Rubber Compounds: Constructed from American-made rubber compounds for durable, dependable performance that riders and work machine owners can count on in demanding conditions.
• Aramex® Inner Cord Construction: The tough Aramex® inner cord reinforces belt integrity under high-load and high-RPM conditions, helping to resist stretching and premature wear that can plague standard OEM-style replacement belts.
• Optimized for Variable Speed Drive Systems: Specifically engineered to enhance the efficiency of CVT (continuously variable transmission) drive systems, providing smooth, consistent engagement across the full range of throttle inputs.
• Reduced Friction & Heat Buildup: The belt's design works to eliminate excessive friction within the clutch system, which can extend the service life of both the belt and your clutch components.
• Direct OEM Replacement Fit: Built to match the dimensional requirements of the factory belt, allowing for a straightforward swap without clutch modification or re-tuning in supported applications.
• Trusted Ultimax Brand: Ultimax has long been a recognized name in ATV/UTV/SxS drive belts, with a fitment guide spanning a wide range of makes and model years — giving buyers confidence that the UA423 is the right belt for the application.

Specifications

• Part Number: UA423
• SKU: ULTUA423
• Brand: Ultimax
• Belt Series: UA (ATV/UTV)
• Inner Cord Material: Aramex®
• Country of Manufacture: USA (rubber compounds)
• Application Type: CVT / Variable Speed Drive Belt

Fitment

According to Ultimax's official ATV/UTV/SxS Drive Belt Fitment Guide, the UA423 is confirmed to fit:

• 2009 Yamaha Grizzly

Ultimax publishes a comprehensive fitment guide covering additional makes and model years, so if your Yamaha ATV or UTV is not listed above, we encourage you to contact our team before ordering to verify compatibility. Do not assume fitment based on belt appearance or length alone — CVT belts must match the specific clutch geometry of your machine. When in doubt, have your OEM part number handy so we can cross-reference it for you.

Why Buy from ThreePiece.us

• Free Shipping: Every order ships free — no minimum purchase required and no surprise freight charges at checkout.
• Affirm Financing: Break your purchase into manageable monthly payments with Affirm financing available at checkout, so you can get your machine back on the trail without waiting.
• Expert Fitment Support: Our team is here to help you confirm the right belt for your specific ATV or UTV before you buy — just reach out with your year, make, model, and OEM part number if available.

Frequently Asked Questions

Q: What vehicle does the Ultimax UA423 fit?

A: Per Ultimax's official fitment guide, the UA423 is listed for the 2009 Yamaha Grizzly. If you're unsure whether it fits your specific variant or trim, contact us with your machine details before ordering.

Q: What makes the Aramex® inner cord important in a CVT belt?

A: The Aramex® inner cord is a high-strength reinforcement material that helps the belt resist stretching, cracking, and delamination under the heavy radial loads generated inside a CVT clutch system. This contributes to longer belt life compared to belts with less robust cord materials.

Q: Is this belt a direct OEM replacement or does it require clutch modifications?

A: The Ultimax UA423 is designed as a direct-fit replacement for CVT-equipped Yamaha ATVs in its fitment range, intended to drop in without clutch modifications. However, always verify your specific application before installation.

Q: Can I use Affirm to finance this belt purchase?

A: Yes — ThreePiece.us offers Affirm financing at checkout, allowing you to split the cost into monthly payments. Simply select Affirm as your payment method when you check out.