124" Big Bore Cylinder Kit for 107" / M8

The S&S Cycles 124" Big Bore Cylinder Kit is designed to provide a significant power boost to Milwaukee-Eight (M8) 107" engines without requiring complex engine modifications. This bolt-on kit increases engine displacement for enhanced horsepower, torque, and throttle response, making it an ideal upgrade for riders seeking more performance.

• Provides excellent results when paired with stock cylinder heads.
• No need to bore or split the existing cases, ensuring a straightforward installation.
• Constructed from premium aluminum castings with cast-in iron liners for durability.

How Does This Big Bore Kit Improve Performance?

This kit maximizes engine output by increasing bore size and compression, creating a more powerful and efficient combustion process.

• Features a 4.250” bore and 4.375” stroke for increased displacement.
• Equipped with 11:1 forged pistons for improved strength and performance.
• Includes all necessary gaskets and hardware for a complete installation.

Is the S&S 124" Big Bore Cylinder Kit Easy to Install?

This kit is designed for a bolt-on installation, meaning no machining is required for the crankcases. However, due to the precision required, a skilled technician is recommended to ensure proper assembly and clearance.

• Requires checking all clearances and assembly specifications before installation.
• Includes cylinders, pistons, rings, and necessary gaskets for a complete setup.
• Made in the U.S.A. with high-quality materials for long-lasting performance.

Will This Kit Fit Your Harley?

The S&S 124" Big Bore Cylinder Kit is designed specifically for 107" Milwaukee-Eight engines but is not recommended for H-D FL Trike models.

Upgrade your Harley-Davidson M8 107" engine with the S&S 124" Big Bore Cylinder Kit for a significant increase in power and performance. Order today and experience the ultimate engine upgrade!