S&S Cycle M8 Big Bore Kit - 4.25" Bore - 128ci - Black - 310-1105C

Elevate your ride's performance with the S&S Cycle 128" Power Package Big Bore Kit, engineered to transform your 114" or 117" CVO engine. This comprehensive motorcycle performance kit delivers a significant displacement increase, providing a noticeable boost in horsepower and torque for an exhilarating riding experience.

Description

The S&S Cycle 128" Power Package is a premium engine upgrade designed for motorcycle enthusiasts seeking maximum power without extensive modifications. This bolt-in kit allows for a seamless transition from a 114" or 117" CVO engine to a robust 128" displacement, all without requiring case machining. At its core are high-strength forged pistons, engineered for durability and optimal performance under extreme conditions. With an aggressive 11.1:1 compression ratio, this kit ensures crisp throttle response and a powerful punch across the RPM range. The Power Package comes complete with an S&S 550 camshaft, an oil pump/cam plate, Quickee pushrods with chrome covers, tappets, tappet cuffs, and high-performance valve springs, ensuring all critical components are upgraded for reliability and peak output. This meticulously engineered big bore kit is the ultimate solution for riders demanding more from their V-Twin.

Features & Highlights

• Significant Power Increase: Transforms 114" and 117" CVO engines into a potent 128" displacement for a dramatic boost in horsepower and torque.
• Effortless Bolt-In Installation: Designed for convenience, this kit requires no case machining, simplifying the upgrade process.
• Premium Forged Pistons: Includes durable forged pistons, built to withstand high pressures and deliver long-lasting, reliable performance.
• Optimized Compression Ratio: Features an 11.1:1 compression ratio for enhanced throttle response and increased engine efficiency.
• Complete Performance Upgrade: Comes with a comprehensive set of components including an S&S 550 camshaft, oil pump/cam plate, Quickee pushrods with chrome covers, tappets, tappet cuffs, and valve springs.
• Sleek Aesthetics: Black, non-highlighted fins offer a clean, integrated look to your engine.

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
• Cam Drive Type: Chain
• Cooling System: Oil Cooled
• Color/Finish: Black, Non-Highlighted Fins
• Features: Quickee Pushrods w/Chrome Covers, Cam Chain Tensioner
• Vendor Part Number: 310-1105C

Important to Know

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