Koyo B-138 Needle Roller Bearing Steel Cam

Description

Product Overview

The Koyo B-138 full complement needle roller bearing is a precision‑engineered component designed specifically for Harley Davidson Evolution single‑cam engines produced between 1958 and 1999. Manufactured by KOYO, a former Torrington brand, this bearing features an inner diameter of 20.64 mm (0.8125 in), an outer diameter of 26.99 mm (1.0625 in) and a width of 12.70 mm (0.5 in). Constructed from high‑grade bearing steel, it offers exceptional radial load handling and operates smoothly at high rotational speeds, making it ideal for confined engine spaces.

Usage

This bearing is the definitive replacement for the cam bearing in single‑cam Harley Davidson models. It excels in high‑performance riding, daily commuting, and restoration projects where reliability and precision are paramount. Install the B‑138 in any compatible Evolution engine to restore optimal camshaft function and ensure consistent power delivery.

Why Choose Us

Choosing the Koyo B-138 means selecting a product made in the USA with rigorous quality control standards. The bearing’s full complement needle design distributes loads evenly, reducing wear and extending service life. Our partnership with Mbs Manufacturing guarantees authentic parts, backed by a 5‑star rating from 17 verified customers.

Key Features

• Precision‑machined steel for high load capacity and durability
• Full complement needle design ensures even load distribution
• Exact dimensions match original OEM specifications
• Made in USA with strict quality assurance processes
• Ideal for Harley Davidson Evolution single‑cam engines (1958‑1999)

FAQ

Is the B-138 compatible with all Harley Davidson single‑cam models?

Yes, the B-138 is the specified cam bearing for Evolution single‑cam engines produced from 1958 through 1999.

Can I install this bearing myself?

With basic mechanical tools and a service manual, most experienced DIYers can replace the cam bearing. However, professional installation is recommended for optimal results.

What makes the Koyo bearing superior to generic alternatives?

Koyo’s full complement needle design and premium steel construction provide superior load handling, reduced wear, and longer service intervals compared to standard bearings.

Does the bearing come pre‑lubricated?

Yes, the bearing is supplied with a high‑temperature grease suitable for engine environments.

What is the warranty on this product?

The bearing carries a limited one‑year warranty against manufacturing defects when installed according to the manufacturer’s guidelines.