✓ VERIFIED
Sep 26, 2019
Really nice kit great directions for install and ring gap. Follow the directions and you can't go wrong..
S&S CYCLE
SKU: T14-662043
S&S Cycle Piston Ring Sets — Harley-Davidson Street Glide, Softail Fat Boy 114, Road King Special (2017-2026)
$102.95
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S&S Cycle piston ring set for 4.320 in. bore, engineered for Harley-Davidson M8 engines 2017 and newer. One complete ring set per pack; direct replacement for stock rebuilds or high-performance applications.
Features
- 4.320 in. bore size
- Fits 2017+ M8 engines
- One complete ring set per pack
Specifications
- Brand: S&S Cycle
- Manufacturer Part #: 940-0066
- Bore Size: 4.320 in.
- Category: Engine Components / Piston Rings
- Weight: 0.06 lb
- Quantity: 1 pack
Fitment
Fits Harley-Davidson M8 engines, 2017 model year and newer.
Frequently Asked Questions
Will these fit my Twin Cam engine?
No — this ring set is specific to M8 (Milwaukee-Eight) engines only. Twin Cam owners need a different part number.
Do I need a complete gasket set along with these rings?
Anytime you install new piston rings, replace all engine gaskets and seals to prevent oil leaks during reassembly.
Are these for stock or performance builds?
S&S Cycle rings work in both stock rebuilds and high-performance applications. Consult your engine builder for exact specifications.
| BRAND | S&S Cycle |
| TYPE | Piston Rings |
| SKU | T14-662043 |
| WEIGHT | 0.06 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.88
8 RATINGS
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✓ VERIFIED
Apr 26, 2022
Excellent service and pricing im very satisfied
✓ VERIFIED
Sep 26, 2019
Better than OEM.. can't go wrong.
✓ VERIFIED
Mar 30, 2026
Very happy with this kit
Simple, easy kit.
✓ VERIFIED
Mar 29, 2026
SMS makes great aftermarket upgrades
✓ VERIFIED
Oct 24, 2025
👍👍 For fast delivery
Parts came just like as expected. They look great! Can't wait to install these bad boys along with a few other parts.
