S&S Cycle 129" Big Bore Power Package for M8 VVT Models

Transform your 107" M8 VVT engine into a high-performance 129" powerhouse with the S&S Cycle 129" Big Bore Power Package. This bolt-on upgrade delivers a significant displacement increase without requiring any complex case machining, making it an ideal choice for enthusiasts seeking a substantial boost in performance.

Description

Engineered for motorcycle enthusiasts craving more power, the S&S Cycle 129" Big Bore Kit is a comprehensive upgrade designed specifically for 107" M8 VVT models. This exceptional package boosts your engine's displacement to a formidable 129", dramatically enhancing horsepower and torque. At its core are precision-engineered 4.32" bore cylinders paired with robust 11.0:1 compression ratio forged pistons, ensuring optimal combustion and long-term durability. The kit includes an advanced S&S oil pump and cam plate, featuring a striking blue anodized finish, designed with increased oil flow capacity for both feed and scavenge sides. Independent scavenge sections for the flywheel cavity and cam chest, along with debris screens and a cam chest magnet, work together to maintain superior engine lubrication and cleanliness. Further enhancing performance and reliability are S&S 550 cams, optimized for big bore applications, complemented by Quickee pushrods, premium tappets, and hard-anodized, black coated billet aluminum tappet cuffs. High-performance conical valve springs support cams with up to 0.605" lift, providing reliable valvetrain operation. Proudly Made in the USA, this S&S VVT power package offers a professional-grade engine upgrade that is both powerful and reliable.

Features & Highlights

• Effortless 107" M8 to 129" Upgrade: Achieve a significant displacement increase without the need for case machining, providing a true bolt-on big bore kit solution.
• Optimized Power & Compression: Features 4.32" bore cylinders and 11.0:1 compression ratio forged pistons for maximum power output and engine efficiency.
• Advanced Oil Management System: Includes an S&S oil pump/cam plate with a blue anodized finish, independent scavenge sections, and enhanced oil flow capacity for superior lubrication and engine protection.
• Robust Valvetrain Components: Equipped with S&S 550 cams, Quickee pushrods, premium tappets, and billet aluminum, hard-anodized black coated tappet cuffs for exceptional durability and performance.
• High-Performance Valve Springs: Conical single wire spring design supports cams with up to 0.605" lift, ensuring reliable operation under extreme conditions.
• User-Friendly Design: Features removable passage plugs for easy servicing and an adjustable pressure relief valve that can be fine-tuned while installed in the engine.
• Proudly Made in the USA: Guarantees superior quality and craftsmanship from a trusted American manufacturer.

Technical Specifications

• Displacement Increase: 107" M8 to 129"
• Cylinder Bore: 4.32"
• Compression Ratio: 11.0:1
• Piston Type: Forged
• Cam Model: S&S 550
• Maximum Cam Lift Support: 0.605"
• Oil Pump/Cam Plate Finish: Blue Anodized
• Tappet Cuffs Material: Billet Aluminum, Hard-Anodized Black Coated
• Manufacturing Origin: Made in the USA
• EAN: 09040208

Important to Know

• Compatibility: Will fit VVT models.
• Exclusions: Not for any Trike models.
• Not Included: Intake/rocker cover gaskets.