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, delivering increased displacement and power over stock internals. Features highlighted fin design for improved cooling and a complete bolt-on assembly that fits directly into M8 models.

Features

• Highlighted fin design for improved cooling
• Complete cylinder and piston assembly
• Direct bolt-on fit for M8 engines
• Increased displacement over stock

Specifications

• Brand: S&S Cycle
• Manufacturer Part #: 910-1008A
• Category: Engine Components / Piston Sets - Powersports
• Weight: 30 lb

Fitment

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

Frequently Asked Questions

Will this increase my horsepower?

Yes — increased displacement from the larger bore and stroke produces measurable gains over stock M8 cylinders.

Is this a complete kit or do I need additional parts?

This is a complete cylinder and piston assembly. Check your specific M8 model year for any additional gaskets or seals needed during installation.

Do I need to tune my bike after installation?

A fuel and ignition tune is recommended to optimize performance and ensure proper air-fuel ratio with the larger displacement.

Will this fit all M8 models?

This kit is designed for Harley-Davidson Milwaukee-Eight models. Verify your exact year and model on the S&S website before ordering.