Overview

S&S Cycle 128 in. Power Packages with Chain Drive Cam

S&S Cycle offers 128 in. power packages with chain drive cam for a variety of Harley-Davidson© street bikes from 2017 and up. Kit details include:

BIG BORE KIT:
* 4.250 in. bore
* Forged pistons
* 11.1:1 compression ratio

OIL PUMP/CAM PLATE:
* Precision-machined from billet aluminum
* Passage plugs removable for servicing
* Independent scavenge sections for flywheel cavity and cam chest
* Debris screens in both scavenge pickups
* Magnet in cam chest to help stop debris from entering oil pump
* Increased flow capacity on both feed and scavenge side
* Pressure relief valve is adjustable with unit installed in engine
* Kits now include updated oil pump with groove for optional OEM oil seal

PUSHRODS:
* Quickee pushrods with chrome covers

TAPPETS:
* Hand-assembled to exacting tolerances
* Reduced valvetrain noise from start-up to shut-down
* Close tolerances for low leak-down rates
* Fast pump-up and superior high-RPM performance

TAPPET CUFFS:
* Hard anodized black coating
* Billet aluminum construction
* Stronger than stock material eliminates distortion
* Improve tappet stability in high lift and high RPM situations

CAM:
* S&S 550 cam—designed for big bore applications
* Available in both chain drive and gear drive variations

VALVE SPRINGS:
* Work well with cams up to .605 lift
* High performance conical single-wire spring
* Includes top collars, keepers, and valve seals/bottom collars

CAM CHAIN TENSIONER:
* Precision-machined from billet aluminum
* Thicker shoe for longer wear
* Direct chain oiling
* Larger piston for more consistent pressure
* Tighter tolerances improve stability

Applications

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