S&S Cycle 129" Power Package Engine Performance Kit for M8

Unleash incredible power from your 107" Milwaukee-Eight® engine with the S&S Cycle 129" Power Package engine performance kit. This comprehensive bolt-on upgrade transforms your M8, boosting displacement to 129" without requiring any case machining, making for a straightforward installation and a significant motorcycle engine upgrade.

Description

Designed for motorcycle enthusiasts seeking a substantial power boost, the S&S Cycle 129" Power Package delivers an immediate performance increase to your 107" M8 engine. This kit features robust 4.320" big bore cylinders paired with 11.0:1 forged pistons, engineered to deliver maximum horsepower and torque. The included S&S oil pump and cam plate system ensures superior lubrication, featuring independent scavenge sections for both the flywheel cavity and cam chest, complete with debris screens and a magnet to prevent contaminants from reaching the pump. This enhanced oil flow capacity and protection contribute to the longevity and reliability of your high-performance engine.

Installation is simplified with Quickee pushrods and pushrod tubes, alongside S&S premium tappets and hard-anodized, billet aluminum tappet cuffs for exceptional durability. The adjustable pressure relief valve allows for fine-tuning even after installation, providing flexibility for various riding conditions. The kit incorporates S&S valve springs, compatible with cams up to 0.605" lift, and the high-performance HPT496 cam, specifically designed for big bore applications. A multi-layered steel (MLS) head gasket ensures a robust, leak-free seal. Notably, this Harley-Davidson M8 big bore kit retains stock engine height, works with stock crankcases, and preserves your original engine serial numbers, making it a seamless and compliant bolt-on M8 power package. Compatible with both stock and S&S roller rocker arms, and first or second-generation stock valve springs, this kit is truly a comprehensive solution.

Features & Highlights

• Transforms your 107" M8 engine into a powerful 129" powerhouse with a bolt-on design, requiring no case machining for easier installation.
• Equipped with 4.320" big bore cylinders and 11.0:1 forged pistons, delivering a significant increase in compression and engine output.
• Features an advanced S&S oil pump/cam plate with independent scavenge sections, debris screens, and a cam chest magnet for superior lubrication and engine protection.
• Includes Quickee pushrods, premium tappets, and hard-anodized billet aluminum tappet cuffs for enhanced durability and simplified maintenance.
• Optimized with an HPT496 cam and high-performance conical valve springs (up to 0.605" lift) specifically engineered for big bore applications.
• Maintains stock engine height, works seamlessly with stock crankcases, and retains original engine serial numbers for a hassle-free upgrade.

Technical Specifications

• Type: Engine Performance Kit
• Product Name: Power Package
• Model: HPT496 Series
• Displacement: 129"
• Bore Size: 4.320"
• Compression Ratio: 11.0:1
• Cam Drive Type: Gear
• Cooling System: Oil Cooled
• Color/Finish: Black, Highlighted Fins
• Features: Chrome Pushrod Tubes
• Units: Kit
• Vendor Part Number: 310-1399

Free shipping to GLS parcel shop parcel box for purchases over DKK 1,000.

GLS home delivery costs DKK 59.

We do our best to ship your order as quickly as possible. All orders are generally packed within 24 hours on weekdays.

There is a 14-day return policy. Read more