S&S Cycle Cylinder & Piston Kits — Harley-Davidson Street Glide, Softail Fat Boy 114, Road King Special (2017-2026)

S&S Cycle rear cylinder for 2017+ Harley-Davidson Milwaukee-Eight (M8) engines with a 4.320-inch bore, finished in wrinkle black. High-performance replacement cylinder built to OEM specifications and engineered for durability in street and touring applications.

Features

• 4.320 inch bore for M8 engines
• Wrinkle black finish without highlight
• 2017 and newer M8 compatibility
• S&S Cycle engineered construction

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 910-0842
• Bore Size: 4.320 inches
• Position: Rear Cylinder
• Finish: Wrinkle black
• Weight: 12.7 lb
• Category: Engine Components / Piston Sets - Powersports

Fitment

Fits 2017 and newer Harley-Davidson Milwaukee-Eight (M8) models. Verify your engine displacement and bore size before installation.

Frequently Asked Questions

Will this fit my 2017+ M8 Harley?

Yes, if your engine is a stock 4.320-inch bore M8. Confirm bore size with S&S Cycle or your dealer before purchase.

Do I need a matching front cylinder?

This is a rear cylinder only. Order the matching front cylinder separately if performing a complete top-end rebuild.

What's included?

The rear cylinder only. Piston, rings, gaskets, and hardware are sold separately depending on your rebuild kit selection.

Is professional installation required?

Cylinder installation requires engine tear-down and precision work. Professional service is strongly recommended for proper fitting and torque specs.