S&S Cycle Big Bore Piston Kit for 128" Engines

Elevate your motorcycle's performance with the S&S Cycle Big Bore Piston Kit, engineered to deliver significant power and displacement gains. This comprehensive kit provides everything needed for a robust engine upgrade, ensuring enhanced durability and reliability for demanding riders.

Description

Unleash the full potential of your engine with this high-performance S&S Cycle 128 cubic inch big bore piston kit. Designed for motorcycle enthusiasts seeking a substantial power boost, this kit transforms your stock engine into a formidable powerhouse. Featuring a precise 4.250" bore size and a 4.500" stroke length, these pistons are crafted to optimize combustion and maximize torque across the RPM range. The kit includes a complete set of pistons, high-quality rings, durable wristpins, and secure clips, providing a full solution for your engine rebuild or upgrade. Each component is meticulously engineered to S&S Cycle's rigorous standards, ensuring a perfect fit and long-lasting performance. The dished piston head design is optimized for specific compression ratios, calculated with the correct length cylinders as specified by S&S, offering reliability even under extreme conditions. With a +0.010" bore oversize, this S&S Cycle big bore piston set is ideal for achieving a tighter tolerance and superior seal, crucial for maximizing engine efficiency and longevity. This kit is a testament to S&S Cycle's commitment to delivering top-tier motorcycle engine upgrades.

Features & Highlights

• Significant Displacement Increase: Achieve a powerful 128 cubic inch displacement, providing a noticeable boost in horsepower and torque for an exhilarating ride.
• Precision Big Bore Design: Engineered with a 4.250" bore size and a +0.010" oversize for optimal performance, enhanced cylinder sealing, and superior engine efficiency.
• Complete Engine Upgrade Kit: Includes all essential components – pistons, rings, wristpins, and clips – for a hassle-free and comprehensive engine rebuild or performance enhancement.
• Optimized Compression Profile: Features a dished piston head shape, meticulously designed to achieve specific compression ratios for reliable, high-performance operation.
• Durable S&S Cycle Quality: Manufactured by S&S Cycle, a trusted name in motorcycle performance, ensuring exceptional material strength and longevity under rigorous conditions.
• Enhanced Engine Longevity: Built with robust materials and precision engineering to withstand the demands of increased power, contributing to the overall durability of your motorcycle engine.

Technical Specifications

• Product Name: Piston Kit
• Style: Big Bore
• Units: Kit
• Bore Size: 4.250"
• Bore Oversize: +0.010"
• Displacement: 128"
• Stroke Length: 4.500"
• Piston Head Shape: Dished
• Vendor Part Number: 920-0142
• MPN/SKU: 09106522

Important to Know

• Compression ratios listed are approximate and are calculated using the correct length cylinders as specified by S&S.
• This kit includes pistons, rings, wristpins, and clips. Cylinders, gaskets, and other engine components are not included and must be purchased separately.