What does the moly coating on these piston rings do?

The moly coating is a molybdenum compound applied to the ring surface. It's known for improving wear resistance, helping the rings last longer. It also aids in heat tolerance and contributes to better sealing between the piston and cylinder wall.

Are these rings a direct replacement for all 1984-1999 Big Twin engines?

This set is designed for standard size pistons in 1984-1999 Harley-Davidson Big Twin engines. It fits many specific models like the Dyna Super Glide, Heritage Softail Classic, and Road King, but always verify fitment for your exact motorcycle.

What is the difference between standard and oversized piston rings?

Standard size rings are meant to be used with pistons that are the original bore size for the engine. Oversized rings, like those marked .010 or .020, are used when the cylinder has been bored out to a larger diameter to accommodate a new piston.

S&S Cycle Piston Ring Set Standard 94-2216X - Harley-Davidso

Name: S&S Cycle 84-99 BT 3-1/2in Piston Ring Set - Standard
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-84-99-bt-3-1-2in-piston-ring-set-standard-t14-662650
Price: 65.63 USD
Availability: BackOrder

S&S Cycle 84-99 BT 3-1/2in Piston Ring Set - Standard

$65.63

On Backorder — Expected to ship by May 7, 2026

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

S&S Cycle Moly Faced piston rings for 1984-1999 Harley-Davidson Big Twin. Offers improved wear resistance and heat tolerance.

Key Features

Fits 1984-1999 Harley-Davidson Big Twin models.
Moly faced coating offers improved wear resistance.
Coating enhances heat tolerance for demanding engine conditions.
Contributes to improved sealing capabilities for better engine performance.
Standard size rings for use with non-oversized pistons.
Designed for engine component applications.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

S&S Cycle is well-known for making performance engine parts for Harley-Davidson motorcycles. If you're rebuilding the top end of your Big Twin engine from 1984 to 1999, this standard size piston ring set is a solid choice. These rings are designed to provide a good seal between your piston and cylinder wall, which is crucial for engine performance and efficiency.

What sets these rings apart is their moly face coating. This molybdenum compound is applied to the ring surface to give you improved wear resistance, meaning they'll hold up better over time. It also helps with heat tolerance, so they can handle the demands of your engine, and contributes to better sealing capabilities for improved compression and reduced oil consumption. They are a standard size, meaning they are meant to be used with pistons that have not been bored out.

This set fits a wide range of Harley-Davidson Big Twin models, including popular bikes like the Dyna Super Glide, Heritage Softail Classic, and Road King. Always check the full fitment list to confirm compatibility with your specific motorcycle.