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 Milwaukee-Eight (M8) engines, featuring finned cylinder design for improved cooling. Complete assembly delivers increased displacement and compression for more horsepower and torque in M8-powered Harleys.

Features

• Finned cylinder design for heat dissipation
• Complete piston and cylinder assembly
• S&S Cycle engineering and quality control
• Direct fit for M8 engine platform

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 910-0909A
• Category: Engine Components / Piston Sets - Powersports
• Weight: 30 lb

Fitment

Fits Harley-Davidson Milwaukee-Eight (M8) engines.

Frequently Asked Questions

What engines does this kit fit?

Milwaukee-Eight (M8) engines only. Not compatible with Twin Cam or other Harley engine platforms.

Does this require professional installation?

Yes — cylinder and piston installation requires engine disassembly, proper torque specs, and precision gapping. Have a qualified shop perform the work.

Will this kit increase horsepower?

Yes — the increased displacement and compression ratio designed into this kit raises horsepower and torque output compared to factory M8 specifications.

What's included in the kit?

Complete piston and finned cylinder assembly ready for installation into your M8 engine.