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

The S&S Cycle 129" Power Package Big Bore Kit is engineered to dramatically transform your 107" M8 VVT engine, boosting its displacement to a formidable 129". This complete bolt-on performance kit delivers a significant power increase without the need for complex and costly case machining, making it an ideal upgrade for motorcycle enthusiasts seeking serious performance gains.

Description

Unleash the full potential of your Harley-Davidson M8 VVT engine with the S&S Cycle 129" Power Package. This comprehensive big bore kit is designed to upgrade your existing 107" M8 to a potent 129" displacement, providing a substantial increase in horsepower and torque. The kit features high-quality 4.32" bore cylinders paired with durable 11.0:1 compression forged pistons, ensuring robust performance and reliability. A key benefit is the bolt-on installation, which eliminates the need for expensive and time-consuming case machining.

Beyond just increased displacement, this S&S Cycle 129" Big Bore Kit incorporates advanced engineering throughout. It includes an S&S oil pump and cam plate, finished with a distinctive blue anodized coating, featuring independent scavenge sections for both the flywheel cavity and cam chest to optimize oil control. Debris screens in both scavenge pickups and a magnet in the cam chest further protect your engine by preventing contaminants from entering the oil pump. The system boasts increased oil flow capacity on both the feed and scavenge sides, complemented by an adjustable pressure relief valve that can be serviced while installed. Performance is further enhanced by Quickee pushrods, S&S premium tappets, and hard-anodized, black coated billet aluminum tappet cuffs. The S&S 550 cams are specifically designed for big bore applications, working in conjunction with high-performance conical single wire S&S valve springs capable of handling up to 0.605" lift. Proudly made in the USA, this kit is built for superior quality and lasting durability.

Features & Highlights

• Bolt-On 129" Displacement Upgrade: Effortlessly transform your 107" M8 VVT engine to a powerful 129" without the need for complex and costly case machining.
• High-Performance Cylinder & Piston Design: Features precision-engineered 4.32" bore cylinders and robust 11.0:1 compression forged pistons for maximum power and reliability.
• Optimized Oil System: Includes an S&S oil pump/cam plate with a striking blue anodized finish, independent scavenge sections, debris screens, and a cam chest magnet to ensure superior lubrication and engine protection.
• Enhanced Valvetrain Components: Equipped with S&S 550 cams tailored for big bore applications, Quickee pushrods, premium tappets, and durable hard-anodized black coated billet aluminum tappet cuffs.
• Advanced Valve Springs: Utilizes high-performance conical single wire S&S valve springs designed to accommodate cams with up to 0.605" lift, ensuring optimal valve control.
• Adjustable Pressure Relief Valve: Allows for convenient pressure adjustments even with the unit installed in the engine, providing fine-tuned control over your oil system.
• Proudly Made in the USA: Guarantees exceptional quality, craftsmanship, and durability for your high-performance motorcycle.

Technical Specifications

• Kit Type: Big-bore bolt-on kit
• Target Displacement: Increases 107" M8 to 129"
• Cylinder Bore: 4.32"
• Compression Ratio: 11.0:1
• Piston Type: Forged
• Oil Pump/Cam Plate Finish: Blue anodized
• Tappet Cuff Material/Finish: Billet aluminum, hard-anodized black coated
• Cam Profile: S&S 550
• Valve Spring Lift Capacity: Up to 0.605"
• Valve Spring Design: High-performance conical single wire
• Manufacturing Origin: Made in the USA
• EAN: 09040205

Important to Know

• Will fit VVT models.
• Not for any Trike models.
• Intake/rocker cover gaskets not included.