- Works with stock crankcases (no machine work)
- Huge bore increase means huge power increase
- Powder coat finish matches factory finish
- MLS (multi-layered steel) head gaskets
- Includes Cubic Inch Cam Cover Badge
- Retains stock engine height
- 4.320" Bore
- Made in USA
The S&S Cycle 129 in Big-Bore Kit is designed for 2017 and newer M8 models. It uses a 4.320 in bore and a 4.375 in stroke to convert a 107 in M8 engine to 129 in. The kit can also convert a 114 in M8 engine to 132 in, providing a substantial increase in displacement while retaining the stock engine height.
This slip-in kit is designed to work with stock crankcases without machine work. It features non-highlighted cylinders with a powder coat finish intended to match the factory finish, along with MLS (multi-layer steel) head gaskets. The kit also includes a Cubic Inch Cam Cover Badge.
Manufacturer part number: 910-0844A. Vendor part number: 910-0844A. Fitment is listed for 2017 and newer M8 models, including 107 in and 114 in configurations as described by the manufacturer. This product is not California Air Resources Board approved.
Features:
- Fitment: Designed for 2017 and newer M8 models
- Displacement: Converts a 107 in M8 engine to 129 in or a 114 in M8 engine to 132 in
- Bore: 4.320 in
- Stroke: 4.375 in
- Installation: Slip-in design works with stock crankcases without machine work
- Engine Height: Retains stock engine height
- Finish: Powder coat finish matches the factory finish
- Gaskets: Includes MLS (multi-layer steel) head gaskets
- Accessory: Includes Cubic Inch Cam Cover Badge
- Manufacturing: Made in USA
- Regulatory Status: Not California Air Resources Board approved
Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Regular Stock: false
Units Per Sku: 1