What is the primary function of main bearings in an engine?

Main bearings support the crankshaft within the engine block. They allow the crankshaft to rotate smoothly while handling the forces generated during combustion, ensuring efficient engine operation.

Are these bearings a direct replacement for the stock Yamaha bearings?

Yes, these main bearings are manufactured by the same suppliers to OEMs, including leading Japanese manufacturers, and are inspected for accuracy and function, making them a reliable replacement for your stock bearings.

What does it mean that these are inspected for cleanliness?

Inspection for cleanliness ensures that no debris or contaminants are present on the bearings before installation. This is crucial for proper function and longevity, as even small particles can cause premature wear.

Wiseco Main Bearing Kit - 20x47x14/20x52x15

Specifications

Brand: Wiseco
Part #: BK5069
UPC: 193564561930

Wiseco Main Bearing Kit - 20x47x14/20x52x15

Name: Wiseco Main Bearing Kit - 20x47x14/20x52x15
Brand: Wiseco
Price: 34.30 USD
Availability: InStock

$34.30

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2018-2025 Yamaha YZ65. Wiseco Main Bearing Kit for reliable engine service.

Key Features

Fits 2018-2025 Yamaha YZ65 and 2019-2025 Yamaha YZ85.
Manufactured by the same suppliers to OEMs, including leading Japanese manufacturers.
Precision machined and finished with high-quality materials.
Inspected for accuracy, function, and cleanliness for reliable service.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Fits these vehicles

Yamaha YZ65 2018-2025
Yamaha YZ85 2019-2025

Product Details

Wiseco is known for making well-built engine components, and this main bearing kit is no exception. If you're rebuilding the engine on your 2018-2025 Yamaha YZ65 or 2019-2025 YZ85, these bearings are a solid choice for getting your machine back on the track.

These main bearings are made by many of the same suppliers that provide parts to Original Equipment Manufacturers, including top Japanese companies. Each bearing is carefully inspected to make sure it's accurate, functions correctly, and is clean, all of which are important for efficient and dependable engine operation. Precision machining and quality materials mean these bearings are built to last.