What is the benefit of a Moly Faced piston ring?

Moly Faced piston rings are coated with a molybdenum compound. This coating offers improved wear resistance, better heat tolerance, and helps create a more effective seal between the piston and cylinder wall.

What does 'Standard' size mean for these rings?

Standard size rings are meant to fit pistons and cylinders that are within the manufacturer's original specifications. If your engine components are within factory tolerances, standard size rings are typically the correct choice.

Are these rings compatible with all 1999+ Big Twin engines?

This ring set is designed for 1999 and newer Big Twin engines. However, it's always best to verify fitment with your specific engine model and piston size to ensure compatibility.

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Trusted Since 1957

Est. 1957

Specifications

Brand: S&S Cycle
Part #: 94-1290X
UPC: 94-1290X

S&S Cycle 1999+ BT 3-7/8in Piston Ring Set - Standard

Name: S&S Cycle 1999+ BT 3-7/8in Piston Ring Set - Standard
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-1999-bt-3-7-8in-piston-ring-set-standard-t14-661819
Price: 64.61 USD
Availability: BackOrder

$64.61

On Backorder — Expected to ship by May 23, 2026

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

Includes a standard size Moly Faced piston ring set from S&S Cycle for improved wear resistance.

Key Features

This product includes a standard size Moly Faced piston ring set.
The moly coating offers improved wear resistance.
These rings also have improved heat tolerance.
The molybdenum compound helps improve sealing capabilities.

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About this part

Product Details

What you get here is a standard size set of Moly Faced piston rings from S&S Cycle. These rings are coated with a molybdenum compound, which is a solid way to get better wear resistance, handle more heat, and improve how well the piston seals against the cylinder wall.

If you're rebuilding the top end of your 1999 and newer Big Twin engine, these rings are a well-built option to consider. The moly coating helps them break in smoothly and maintain a good seal over time, which is key for engine performance and longevity.