S&S Cycle 129" Power Pack for M8 Engines - 550 Chain Drive, Oil Cooled, Wrinkle Black with Highlight Fins, Part Number 310-1223C

Product type: Big Bore Kits

Vendor: S&S CYCLE

SKU : 0904-0167

Regular price $3,294.95 USD

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129" Power Pack - 550 Chain Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - 107" M8 Upgrade your M8 engine...

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129" Power Pack - 550 Chain Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - 107" M8

Upgrade your M8 engine with the S&S Cycle 129" Power Pack, designed to boost performance without requiring case machining. This bolt-on kit increases the engine's displacement from 107 inches to 129 inches, providing significant power gains for street and performance enthusiasts. The kit features 4.32-inch bore cylinders equipped with forged pistons that have an 11.0:1 compression ratio, ensuring durability and high-performance operation. The combination of high-quality components and precise engineering delivers reliable power enhancement for your motorcycle. The oil system is optimized with an S&S oil pump and cam plate finished in a durable blue anodized coating, featuring removable passage plugs for straightforward servicing. Independent scavenge sections for the flywheel cavity and cam chest, along with debris screens in both pickups and a magnet in the cam chest, help prevent debris from contaminating the oil pump, thereby extending engine life. Enhanced oil flow capacity on both feed and scavenging sides ensures optimal lubrication under demanding conditions. The adjustable pressure relief valve allows fine-tuning of oil pressure with the engine in place, offering customization based on riding preferences. The kit includes quickee pushrods, S&S premium tappets, and hard-anodized, black-coated tappet cuffs made from billet aluminum, contributing to durability and efficient valve operation. S&S 550 cams, specifically designed for big bore applications, provide a significant performance increase, compatible with valve springs supporting up to 0.605-inch lift. The high-performance conical single wire spring design ensures reliable valve control at high RPMs. Complete with all necessary gaskets, bearings, and hardware, this kit offers a straightforward bolt-on installation. Made in the USA, the S&S Cycle 129" Power Pack combines premium components and engineering excellence to deliver increased power, reliability, and customizability for your M8 engine.

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