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) models with a 4.320-inch bore. Features wrinkle black finish with highlight detailing and is sold as a cylinder-only component for engine builders and performance shops.

Features

• 4.320 in bore
• 2017+ M8 engine compatibility
• Wrinkle black finish with highlight
• Rear cylinder position

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 910-0837
• Bore Size: 4.320 in
• Position: Rear cylinder
• Weight: 12.7 lb
• Category: Engine Components / Piston Sets - Powersports

Fitment

Fits 2017 and newer Harley-Davidson models with Milwaukee-Eight (M8) engines.

Frequently Asked Questions

Does this come as a complete piston kit or cylinder only?

This is a cylinder-only component. Check with S&S Cycle for complete piston assembly kits if you need matched internals.

Will this fit my 2016 or older Harley?

No — this cylinder is designed for 2017+ Milwaukee-Eight engines. Twin Cam models require different cylinders.

What's the bore size?

4.320 inches. Verify your engine specifications before ordering to ensure compatibility with your existing pistons and components.