S&S CYCLE 129" Big-Bore Kit 4.375" Stroke Non-Highlighted Cylinders for '17-'23 M8 Models - 910-0844
The biggest Big Bore possible with a slip in kit! The S&S 4.320" bore cylinder kit takes your 107" M8 to 129" and the 114" to 132".
- Huge bore increase means huge power increase
- Works with stock crankcases (no machine work)
- Powder coat finish matches factory finish,
- MLS (multi-layered steel) head gaskets
- 4.320" Bore
- Retains stock engine height
- Includes Cubic Inch Cam Cover Badge
- Made in USA
- Bolt-on without requiring machining of the crankcase
- All necessary gaskets and hardware required for installation is included
Fitment Guide
| 2023 | Harley-Davidson | FXBR Breakout 117 | - | - |
| 2022-2023 | Harley-Davidson | FXLRST Low Rider ST 117 | - | - |
| 2022-2023 | Harley-Davidson | FLTRXST Road Glide ST | - | - |
| 2022-2023 | Harley-Davidson | FXLRS Low Rider S 117 | - | - |
| 2022-2023 | Harley-Davidson | FLHXST Street Glide ST | - | - |
| 2022 | Harley-Davidson | Softail Street Bob FXBB | - | - |
| 2021, 2023 | Harley-Davidson | FXBBS Street Bob 114 | - | - |
| 2021 | Harley-Davidson | FLH Electra Glide Revival | - | - |
| 2020-2023 | Harley-Davidson | FXST Softail Standard 107 | - | - |
| 2020-2023 | Harley-Davidson | FLTRK Road Glide Limited | - | - |
| 2020-2021 | Harley-Davidson | FXLRS Low Rider S 114 | - | - |
| 2019-2022 | Harley-Davidson | FLHT Electra Glide Standard | - | - |
| 2018-2021 | Harley-Davidson | FLHC Heritage Classic 107 | - | - |
| 2018-2021 | Harley-Davidson | FLSL Softail Slim 107 | - | - |
| 2018-2021 | Harley-Davidson | FLSB Sport Glide 107 | - | - |
| 2018-2020 | Harley-Davidson | FLDE Deluxe 107 | - | - |
| 2018-2020 | Harley-Davidson | FXBB Street Bob 107 | - | - |
| 2018-2020 | Harley-Davidson | FXLR Low Rider 107 | - | - |
| 2018-2019 | Harley-Davidson | FXFB Fat Bob 107 | - | - |
| 2018-2019 | Harley-Davidson | FLFB Fat Boy 107 | - | - |
| 2018-2019 | Harley-Davidson | FXBR Breakout 107 | - | - |
| 2017-2023 | Harley-Davidson | FLHRXS Road King Special | - | - |
| 2017-2023 | Harley-Davidson | FLHTK Ultra Limited | - | - |
| 2017-2023 | Harley-Davidson | FLHXS Street Glide Special | - | - |
| 2017-2023 | Harley-Davidson | FLTRX Road Glide | - | - |
| 2017-2023 | Harley-Davidson | Electra Glide Police FLHTPI | - | - |
| 2017-2023 | Harley-Davidson | FLRT Freewheeler | - | - |
| 2017-2023 | Harley-Davidson | FLTRXS Road Glide Special | - | - |
| 2017-2023 | Harley-Davidson | FLHTCUTG Tri Glide Ultra | - | - |
| 2017-2023 | Harley-Davidson | FLHX Street Glide | - | - |
| 2017-2022 | Harley-Davidson | FLHR Road King | - | - |
| 2017-2019 | Harley-Davidson | FLHTKL Ultra Limited Low | - | - |
| 2017-2019 | Harley-Davidson | FLHTCU Electra Glide Ultra Classic | - | - |
| 2017-2019 | Harley-Davidson | FLTRU Road Glide Ultra | - | - |
| 2017-2022 | Harley-Davidson | CVO Street Glide FLHXSE | - | - |
| 2017-2021 | Harley-Davidson | Electra Glide Police FLHTPI | - | - |
| 2017-2021 | Harley-Davidson | CVO Electra Glide Ultra Limited FLHTKSE | - | - |
| 2017-2019 | Harley-Davidson | Electra Glide Ultra Limited Low FLHTKL | - | - |
| 2017-2019 | Harley-Davidson | Road Glide Ultra FLTRU | - | - |
| 2017-2019 | Harley-Davidson | Electra Glide Ultra Classic EFI FLHTCUI | - | - |
Specs
| PRODUCT NAME | CYLINDER KIT |
| TYPE | BIG BORE |
| BASE COLOR | BLACK |
| COLOR/FINISH | WRINKLE BLACK / NON-HIGHLIGHTED FINS |
| BORE SIZE | 4.320" |
| DISPLACEMENT | 129" |
| STROKE LENGTH | 4,375" / 4.375" |
| ENGINE TYPE | 4-STROKE |
| UNITS | KIT |
| RIDING STYLE | STREET |
Delivery Info
Please Note - Warehouse Locations For This Part -
S&S CYCLE 129" Big-Bore Kit 4.375" Stroke Non-Highlighted Cylinders for '17-'23 M8 Models - 910-0844
Gold Coast Warehouse- If your parts are in stock at our Gold Coast warehouse at the time of order, they will be shipped within 24hrs.
Supplier Warehouse - 2-3 Week Delivery- If your parts are located at our Supplier Warehouse, Delivery ETA is approx 2-3 weeks, as the parts are likely coming from our USA supplier warehouse. We will notify you once we receive it in Gold Coast warehouse and its on its way to you.