S&S Cycle 128" Big Bore Kit for 114" & 117" M8

Unleash the full potential of your Harley-Davidson Milwaukee-Eight engine with the S&S Cycle 128" big bore kit. Engineered to transform your 114" or 117" CVO model, this comprehensive performance package delivers a significant boost in displacement and power, taking your ride to an exhilarating 128".

Description

Experience a dramatic increase in horsepower and torque with the S&S Cycle 128" Power Package. This meticulously designed Milwaukee-Eight performance kit is a true bolt-in solution, meaning no complex and costly case machining is required for installation. At its core, the kit features robust forged pistons, precisely engineered with a 4.250" bore size and optimized for a 4.500" stroke length, ensuring exceptional durability and reliability under demanding conditions. With an impressive 11.1:1 compression ratio, this upgrade promises an aggressive powerband and enhanced throttle response across the RPM range. The kit also includes a high-performance S&S 550 camshaft, paired with upgraded valve springs, ensuring optimal valvetrain control and maximizing the engine's potential. Integrated components such as the S&S oil pump/cam plate, Quickee pushrods with chrome covers, tappets, and tappet cuffs work in harmony to deliver a cohesive and powerful engine upgrade, making it an ideal choice for riders seeking a significant Harley-Davidson 114" engine upgrade.

Features & Highlights

• Massive Displacement Increase: Elevate your 114" or 117" Milwaukee-Eight CVO engine to a potent 128" for unparalleled power and torque, transforming your ride's performance.
• Hassle-Free Installation: Designed as a true bolt-in big bore kit, eliminating the need for complex and costly case machining, saving you time and effort.
• Superior Durability: Features high-strength forged pistons, engineered to withstand extreme pressures and temperatures for long-lasting, reliable performance.
• Optimized Valvetrain: Includes S&S Quickee pushrods with stylish chrome covers, high-performance tappets, and robust tappet cuffs for improved valvetrain stability and efficiency.
• Aggressive Cam Profile: Comes complete with the S&S 550 camshaft and upgraded valve springs, delivering an aggressive powerband and enhanced throttle response for an exhilarating ride.
• Integrated Oil Management: Incorporates a premium S&S oil pump and cam plate assembly, ensuring optimal oil flow and lubrication for critical engine components, enhancing longevity.

Technical Specifications

• Model: Power Package
• Product Name: Performance Kit
• Units: Kit
• Bore Size: 4.250"
• Stroke Length: 4.500"
• Displacement: 128"
• Compression Ratio: 11.1:1
• Cooling System: Water Cooled
• Cam Drive Type: Gear
• Color/Finish: Black, Highlighted Fins
• Features: Quickee Pushrods w/Chrome Covers
• Vendor Part Number: 310-1102C

Important to Know

• Compatibility: Not compatible with 121" CVO models.
• Vehicle Type: Not suitable for any Harley-Davidson Trike models.
• Gaskets: Intake and rocker cover gaskets are not included and must be purchased separately.