Does it fit your motorcycle?
Look it up by licence plate or VIN, or choose your model.
Confirmed compatible · Position:
This part doesn't fit your bike. See parts that fit
Fits most motorcycles
Not model-specific. Check dimensions and specifications in the description before ordering.
Chosen by size, not by model
The size is printed on the tyre sidewall, e.g. 120/70 ZR17, and in your registration document.
Checking fitment…
Fitment check unavailable
S&S Cycle M8 Power Package Engine Performance Kit - 310-1228
Product info
- Item number
- 09040113
- Manufacturer number
- 310-1228
- Position
Unleash the full potential of your 107" oil-cooled Milwaukee-Eight engine with the S&S Cycle 129" Power Package Engine Performance Kit. This comprehensive kit delivers a significant boost in displacement and performance without requiring any case machining, making it an ideal upgrade for enthusiasts and professionals alike.
Description
The S&S Cycle 129" Power Package transforms your stock 107" M8 engine into a powerhouse. This kit features big bore cylinders, a matched 550 cam, cam plate, and high-performance oil pump with independent scavenge sections for the flywheel cavity and cam chest. The inclusion of a magnet in the cam chest provides added protection by preventing debris from entering the oil pump. High-performance conical single-wire S&S valve springs ensure optimal valve train performance. Original engine serial numbers are retained, and passage plugs are removable for easy servicing. Multi-layered steel (MLS) head gaskets provide a reliable seal under high-performance conditions. This kit is designed to work seamlessly with the stock crankcase, ensuring a straightforward installation. Proudly made in the USA, the S&S Cycle 129" Power Package delivers unparalleled performance and reliability.
Features & highlights
- Transforms 107" oil-cooled M8 into a high-performance 129" engine.
- No case machining required for easy installation.
- Includes performance-matched 550 cam for optimal power delivery.
- Features independent scavenge sections for improved oiling and reduced crankcase pressure.
- Magnet in cam chest helps prevent debris from entering the oil pump.
- Retains original engine serial numbers.
- Made in the USA.
Technical specifications
- Brand: S&S Cycle
- Product Name: Performance Kit
- Type: Engine
- Displacement: 129"
- Bore Size: 4.320"
- Stroke Length: 4.375"
- Cooling System: Oil Cooled
- Cam Drive Type: Gear
- Color/Finish: Black, Non-Highlighted Fins
- Features: Black Pushrod Tubes
Important to know
This kit is designed to work with the stock crankcase. Ensure proper installation by a qualified technician.
- Brand
- S&S CYCLE
- Vendor part number
- 310-1228
- Product name
- Performance Kit
- Bore size
- 4,320"
- Displacement
- 129"
- Stroke length
- 4,375"
- Cam drive type
- Gear
- Features
- Black Pushrod Tubes
- Type
- Engine
- Base color
- Black
- Units
- Kit
- Cooling system
- Oil Cooled
Free shipping to a GLS parcel shop or parcel box on orders over €200.
We ship your order as quickly as we can. Orders are usually packed within 24 hours on weekdays.
You have a 14-day right of return. Read more
4.8 out of 5 on TrustpilotRead our reviews →
Certified e-mærket web shop
