Yamaha 4ES-25447-10-00 - YZ85/YZ85LW Rear Sprocket is a motorcycle rear sprocket designed as an accessory part for service and maintenance purposes on select Yamaha off-road models.

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Key Features & Benefits

• Genuine Yamaha OEM fitment — precision-matched tooth profile and hub dimensions for a direct bolt-on fit
• Manufactured to Yamaha's factory tolerances for consistent chain engagement
• Reliable power transfer — precise tooth spacing reduces chain slap and uneven wear
• Confidence in fit — avoids the tolerance issues sometimes seen with generic aftermarket sprockets

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Product Details

The rear sprockets are manufactured from 7075-T6 billet aluminum using CNC machining for precise fit. They feature a radial mud groove etched near the teeth to shed mud and grit, reducing weight and extending chain life. Sprocket sizes other than stock are intended for closed-course competition only and affect emissions and speedometer accuracy.

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Fits These Yamaha Models

Yamaha Model	Compatible Years
YZ80	2000-2001
YZ85	2002-2027

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Frequently Asked Questions

What is Yamaha part 4ES-25447-10-00?

4ES-25447-10-00 is the Yamaha YZ85/YZ85LW Rear Sprocket, a motorcycle accessory part for service and maintenance.

What is Yamaha 4ES-25447-10-00 used for?

This rear sprocket is used to replace or upgrade the sprocket on select Yamaha YZ80 and YZ85 motorcycles for maintenance and closed-course competition.

Which Yamaha models fit 4ES-25447-10-00?

This part fits Yamaha YZ80 models from 2000 to 2001 and YZ85 models from 2002 to 2027. Confirm the SKU and model year compatibility before ordering.

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WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.