Moto-Master 610171113 13T Steel Front Sprocket — 2002-2025 Yamaha YZ85 / LW

Moto-Master — Hardened Steel Strength, Precision Engineering, and Maximum Drivetrain Reliability

Enhance the durability and power transfer of your mini-racer with the Moto-Master 610171113 Front Countershaft Sprocket. Specifically designed for the 2002-2025 Yamaha YZ85 and YZ85 LW (Large Wheel), this 13-tooth sprocket is the professional choice for riders who demand consistency on the track. As the primary point of contact for your engine's power, the front sprocket undergoes immense stress—Moto-Master ensures your drivetrain can handle the high-revving output of the YZ85 engine.

Each sprocket is constructed from top-grade hardened steel, providing exceptional resistance to wear and tooth "hooking." The natural finish showcases the high-quality machining used to ensure perfect concentricity, which minimizes vibration and ensures your chain tracks straight at high speeds. Whether you are attacking a local motocross moto or navigating technical off-road trails, this 13T sprocket delivers the factory-level fitment and reliability that Moto-Master is known for worldwide.

• Hardened Steel Construction: Manufactured from premium high-tensile steel for maximum lifespan and impact resistance.
• 13-Tooth Profile: Standard gearing for the YZ85, optimized for a balanced delivery of bottom-end snap and top-end speed.
• Precision Machined: Engineered for perfect alignment on the countershaft to reduce chain friction and drag.
• Extended Compatibility: Fits all Yamaha YZ85 models from 2002 through the current 2025 model year, including LW versions.
• Off-Road Durability: Built to withstand the abrasive mud and sand common in competitive racing environments.

Moto-House MX Pro Tip:

The front sprocket is often the fastest-wearing part of your drivetrain because it has the smallest radius and makes the most revolutions. When installing the Moto-Master 13T sprocket, always inspect the condition of your rear sprocket and chain. For the best performance and longest life, we recommend replacing the front sprocket whenever you install a new 428 chain. Ensure the countershaft splines are clean and apply a small dab of waterproof grease before sliding the new sprocket on to prevent future corrosion and facilitate easier removal during your next service.

Technical Specification	Details
Tooth Count	13
Chain Size	428
Material	Hardened Steel
Mounting Position	Front (Countershaft)

FAQ Questions

Q) Will this fit the 2025 YZ85 model?
A) Yes, this sprocket is verified to fit all Yamaha YZ85 models from 2002 to 2025.

Q) Does this sprocket require a specific chain type?
A) This is designed for standard 428 pitch chains, including both non-O-ring and O-ring varieties.

Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. We are the best motocross shop in Central Florida with lightning-fast shipping.