What is the bore size for these piston rings?

These piston rings are designed for a 4-1/8 inch (4.125") bore. They are a standard size, meaning they are intended for cylinders that are not significantly oversized.

What material are these piston rings made of?

The piston rings feature a chromoly facing. This material is known for its wear resistance, which helps ensure a proper seal and longevity in the engine.

Are these piston rings compatible with all Big Twin engines?

These rings are specifically designed for 1984-2017 Big Twin motorcycle engines. It's important to verify that your specific Big Twin model falls within this year range and has the correct bore size.

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Specifications

Brand: S&S Cycle
Part #: 940-0014
UPC: 940-0014

S&S Cycle 1984+ BT 4-1/8in Piston Ring Set - 2 Pack

Name: S&S Cycle 1984+ BT 4-1/8in Piston Ring Set - 2 Pack
Brand: S&S Cycle
SKU: s-s-cycle-s-s-cycle-1984-bt-4-1-8in-piston-ring-set-2-pack-t14-619241
Price: 86.85 USD
Availability: BackOrder

$86.85

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 1984+ BT 4-1/8in Piston Ring Set - 2 Pack. Chromoly faced rings for Big Twin engines.

Key Features

This package includes two sets of piston rings.
Features a chromoly facing for wear resistance.
Designed for a 4-1/8 inch (4.125") bore.
Standard size rings.
Intended for 1984-2017 Big Twin motorcycle engines.

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About this part

Product Details

What you get in this package are two sets of chromoly-faced piston rings designed for a 4-1/8 inch bore. These rings are intended for use in Big Twin motorcycle engines from 1984 through 2017. Piston rings are crucial for sealing the combustion chamber, controlling oil consumption, and transferring heat from the piston to the cylinder wall.

The chromoly facing on these rings offers good wear resistance, which is important for maintaining a good seal over time and under demanding conditions. This set is for a standard bore size, meaning it's meant for cylinders that haven't been significantly re-bored or modified from their original specifications. Proper installation is key to ensuring these rings perform as expected, helping your engine run efficiently and reliably.