129" Power Package Engine Performance Kits / '17-'23 107" M8 Oil Cooled Motors

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Transform your '17-'23 Oil Cooled M-Eight from a 107” powerhouse to an astonishing 129” behemoth with the S&S Cycles 129” Power Packages. This big-bore bolt-on kit requires no case machining, making it an ideal upgrade for '17-Up Harley models seeking maximum performance without extensive modifications. Here’s why the 129” Power Package is the ultimate choice for performance enthusiasts:

Key Features:

• Bolt-On Big Bore Kit: Increases your M-Eight’s displacement to 129” with a 4.32” bore and 11:1 forged pistons, enhancing power and torque significantly.
• S&S Oil Pump/Cam Plate: Comes with an S&S oil pump and cam plate, both finished in a stylish blue anodized color. These components ensure optimal oil flow and engine efficiency.
• Removable Passage Plugs: For easy servicing, featuring independent scavenge sections for the flywheel cavity and cam chest to maintain cleanliness and efficiency.
• Debris Prevention: Includes a debris screen in both scavenge pickups and a magnet in the cam chest to keep debris out of the oil pump, protecting your engine from potential damage.
• Increased Oil Flow Capacity: Enhanced oil feed and scavenge side capacity ensure your engine receives all the lubrication it needs, even under high-performance conditions.
• Adjustable Pressure Relief Valve: Allows for on-the-fly adjustments to the oil pressure, ensuring optimal performance without disassembling the engine.
• Quickee Pushrods and S&S Tappets: The kit includes Quickee pushrods with chrome tubes and premium S&S tappets for reliable valve operation and timing.
• S&S 550 Cams: Designed for big bore applications, these cams provide the lift needed to take full advantage of the increased displacement.
• S&S Valve Springs: Compatible with cams up to .605” lift, these springs ensure the valves operate smoothly under high rpm and lift conditions.

Why Choose the 129” Power Package?

• Unmatched Performance Upgrade: This comprehensive kit offers everything needed to significantly increase your M-Eight’s power and torque, providing an unrivaled riding experience.
• Ease of Installation: Designed as a bolt-on solution, this package simplifies the upgrade process, allowing you to maintain the original engine serial numbers and avoid extensive modifications.
• Quality and Durability: S&S Cycles is renowned for its commitment to quality, ensuring this power package not only boosts performance but also maintains the reliability of your engine.

Installation Tips:

• Professional Installation Recommended: Due to the comprehensive nature of this upgrade, professional installation is advised to ensure the best performance and longevity of your engine.
• Compatibility Check: Ensure this power package is compatible with your specific Harley M-Eight model, especially considering the specific requirements and existing modifications.

Elevate your Harley Davidson M-Eight with the S&S Cycles 129” Power Packages and experience unparalleled performance on the open road.