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

S&S Cycle cylinder and piston kit for Harley-Davidson M8 engines, engineered as a complete big-bore replacement assembly for increased displacement and performance. Finless design provides a direct fit on Milwaukee-Eight models.

Features

• Complete cylinder and piston assembly
• M8 engine compatibility
• Finless design
• Direct-fit upgrade

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 910-0910A
• Weight: 30 lb
• Category: Engine Components / Piston Sets - Powersports

Fitment

Fits Harley-Davidson M8 (Milwaukee-Eight) engines. Finless design for seamless integration into M8 cylinder architecture.

Frequently Asked Questions

What displacement does this kit provide?

Contact S&S Cycle or V-Twin Bikers for the specific bore and cc increase for your model year.

Will this fit my Twin Cam or Street 750?

No — this kit is engineered exclusively for Milwaukee-Eight (M8) engines. Twin Cam and Sportster 750 require different assemblies.

Do I need engine tuning after installation?

A professional fuel map adjustment is strongly recommended to optimize performance and ensure proper air-fuel ratio with the increased displacement.

Is this a bolt-on installation?

No — this is a complete cylinder and piston assembly requiring engine disassembly, honing, and professional installation by a qualified technician.

What weight does this add to my engine?

The assembly weighs 30 lbs. Total weight addition depends on what you are replacing and how it's installed.