S&S Cycle 128" Power Pack - Gear Drive with Highlighted Fins - Water Cooled - M8

Big Bore Kit

• 114" to 128" Big Bore Kit
• Black Granite Finish
• Highlighted Fins
• No case machining required
• 4.250" bore

Forged Pistons

• 11.1:1 Compression Ratio
• Oil Pump/Cam Plate:
• Precision Machined from Billet Aluminum
• Blue Anodized Finish
• 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 to stop debris from entering oil pump
• Increased Flow Capacity on both Feed and Scavenge side
• Adjustable Pressure Relief Valve is adjustable with unit installed in engine

Pushrods

• Quickee Pushrods w/Chrome Pushrod Tubes

Tappets

• S&S Precision Tappets

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
• Gear Drive Cam provides improved cam timing accuracy and eliminate the stock cam chain tensioner
• Gear Drive kit includes outer Drive Gears

Valve Springs

• Work well with cams up to .605 lift
• High Performance Conical Single Wire Spring
• Includes all gaskets, bearings, and hardware required for installation
• Made in the U.S.A.

**Not recommended for trike models**

Part Notes

• 128" Package for ’17–’22 M8 models with 114" & 117" engines

Specs

Fitments