What is the purpose of a primary chain adjuster lining?

The primary chain adjuster lining is a component that helps maintain the correct tension on your motorcycle's primary chain. Proper tension is crucial for smooth operation and to prevent excessive wear on the chain and related drivetrain parts.

Which Harley-Davidson models does this lining fit?

This lining fits a range of Harley-Davidson XL models from 1977 through 1990. This includes models like the XLH883, XLH1200, XLS Roadster, and XLCH, among others.

Does this part come with any hardware?

This product is the adjuster lining only. Any necessary mounting hardware would need to be sourced separately, so please check your service manual for specific requirements.

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Trusted Since 1957

Est. 1957

Twin Power 77-90 XL Primary Chain Adjuster Lining Replaces H-D 39966-80

Specifications

Brand: TwinPower
Part #: 492795
UPC: 887337171319

Twin Power 77-90 XL Primary Chain Adjuster Lining Replaces H-D 39966-80

Name: Twin Power 77-90 XL Primary Chain Adjuster Lining Replaces H-D 39966-80
Brand: TwinPower
SKU: twinpower-twin-power-77-90-xl-primary-chain-adjuster-lining-replaces-h-d-39966-8-t14-610465
Price: 9.20 USD
Availability: BackOrder

$9.20

On Backorder — Expected to ship by May 31, 2026

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

Twin Power 77-90 XL Primary Chain Adjuster Lining Replaces H-D 39966-80. Keeps your primary chain properly tensioned.

Key Features

Fits Harley-Davidson XL models from 1977-1990.
Replaces Harley-Davidson part number 39966-80.
Helps maintain proper primary chain tension.
Constructed from a durable composite material.

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Product Details

Made from a durable composite material, this primary chain adjuster lining is built to maintain the correct tension on your Harley-Davidson's primary chain. Keeping that chain properly adjusted is key to smooth operation and preventing premature wear on your drivetrain components. This part is designed to fit a range of Harley-Davidson XL models from 1977 through 1990, including popular bikes like the XLH883 and XLS Roadster.

This lining replaces the original Harley-Davidson part number 39966-80, ensuring a direct fit for the intended applications. It's a well-built component that helps ensure your primary chain stays where it should be, contributing to the overall health of your motorcycle's engine and transmission system.