S&S Cycle M8 Big Bore Kit - 4.25" Bore - 128ci - Black - 310-1101C

Unleash the full potential of your Harley-Davidson Milwaukee-Eight engine with the S&S Cycle 128" Power Package Big Bore Kit. This comprehensive bolt-in big bore kit transforms your 114" or 117" CVO engine into a formidable 128" powerhouse, delivering significant performance gains and a thrilling riding experience.

Description

Engineered for motorcycle enthusiasts seeking a substantial power upgrade, the S&S Cycle 128" Power Package is a complete, high-performance cylinder kit designed for Milwaukee-Eight models. This kit provides a massive displacement increase from 114" or 117" CVO engines to a robust 128", enhancing horsepower and torque across the entire RPM range. A key advantage of this bolt-in big bore kit is its true bolt-in design, meaning no case machining is required for installation, simplifying the upgrade process significantly. The kit features durable forged pistons, ensuring long-lasting reliability under demanding conditions. It comes complete with an S&S oil pump/cam plate, Quickee pushrods with chrome covers, new tappets, tappet cuffs, an S&S 550 camshaft, and high-performance valve springs, providing a holistic engine overhaul. With a high 11.1:1 compression ratio and precision-machined 4.250" bore and 4.500" stroke, this kit is engineered for optimal combustion and maximum power output. The striking black finish with highlighted fins adds a custom aesthetic to your engine, making your bike stand out, truly delivering a superior Harley-Davidson Milwaukee-Eight performance upgrade.

Features & Highlights

• Massive Displacement Increase: Transform your 114" or 117" CVO Milwaukee-Eight engine into a potent 128" power plant, delivering exhilarating horsepower and torque.
• Effortless Bolt-In Installation: Enjoy a straightforward upgrade process with no complex case machining required, saving time and effort.
• Superior Durability & Performance: Equipped with robust forged pistons and an S&S 550 camshaft, ensuring enhanced engine longevity and a significant boost in power.
• Complete Engine Upgrade: Includes an S&S oil pump/cam plate, Quickee pushrods with chrome covers, tappets, tappet cuffs, and high-performance valve springs for a comprehensive overhaul.
• Optimized Compression: Achieves an impressive 11.1:1 compression ratio, coupled with a 4.250" bore and 4.500" stroke, for peak engine efficiency and power delivery.
• Aggressive Aesthetic: Features a black finish with highlighted fins, adding a custom, high-performance look to your motorcycle's engine.

Important to Know

• Not for 121" CVO models.
• Not for any Trike models.
• Intake/rocker cover gaskets not included.