920-0142 S&S M8 114" to 128" big bore piston kit. +.010" for Harley-Davidson
incl. VAT
Chapter members save 1% · Sign in for member pricing
Estimated delivery: 3–15 working days
Authorised
Iron City Dealer
14-Day Returns
Easy & hassle-free
Secure Checkout
256-bit encryption
Free UK Delivery
On orders over £100
Specifications
- Brand
- S&S
- Part Number
- 920-0142
- OEM Reference
- —
- Pack Quantity
- Sold as kit
- Category
- Pistons And Rings Kits
- VAT Rate
- 20%
About This Product
S&S big bore piston kit in plus ten thousandths oversize for a 114 or 117-inch to 128-inch Milwaukee-Eight build. Compression ratio is 11.1:1. These forged pistons suit the factory 4.500-inch stroke. The kit includes rings, wristpins, and clips. You need 4.250-inch big bore cylinders. It fits 2018 to 2024 Softail and 2017 to 2025 Touring models. It does not fit the newest CVO or 2024-up fairing models. An S&S 550 series cam works well here.
Manufacturer part number: 920-0142.
Fitment
68 models18-24 114"/117" Softail; 17-25 114" FLT/Touring/117" FLT/Touring (excl. 23-25 CVO; 24-25 FLTRX; 24-25 FLHX; 2025 FLHXU)
CVO/Custom 2 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 2017 | CVO Limited FLHTKSE |
| Harley-Davidson | 2017 | CVO Street Glide FLHXSE |
Police 8 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 2017–2020 | Electra Glide Standard Police FLHTP |
| Harley-Davidson | 2025 | Police Electra Glide FLHTP |
| Harley-Davidson | 2021–2024 | Police Electra Glide FLHTP |
| Harley-Davidson | 2025 | Police Road Glide FLTRXP |
| Harley-Davidson | 2024 | Police Road Glide FLTRXP |
| Harley-Davidson | 2025 | Police Road King FLHP |
| Harley-Davidson | 2022–2024 | Police Road King FLHP |
| Harley-Davidson | 2018–2020 | Road King Police FLHP |
Softail 27 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 2018 | Breakout 114 Anniversary FXBRS |
| Harley-Davidson | 2019–2022 | Breakout 114 FXBRS |
| Harley-Davidson | 2018 | Breakout FXBR |
| Harley-Davidson | 2018–2020 | Deluxe FLDE |
| Harley-Davidson | 2019 | FXDR 114 FXDRS |
| Harley-Davidson | 2019–2024 | Fat Bob 114 FXFBS |
| Harley-Davidson | 2019 | Fat Bob FXFB |
| Harley-Davidson | 2025 | Fat Boy FLFB |
| Harley-Davidson | 2018 | Fat Boy 114 Anniversary FLFBS |
| Harley-Davidson | 2018–2024 | Fat Boy 114 FLFBS |
| Harley-Davidson | 2023 | Fat Boy Anniversary FLFBSANV |
| Harley-Davidson | 2019–2020 | Fat Boy FLFB |
| Harley-Davidson | 2025 | Heritage Classic FLHC |
| Harley-Davidson | 2018 | Heritage Classic 114 Anniversary FLHCS |
| Harley-Davidson | 2018–2024 | Heritage Classic 114 FLHCS |
| Harley-Davidson | 2023 | Heritage Classic Anniversary FLHCSANV |
| Harley-Davidson | 2018–2021 | Heritage Classic FLHC |
| Harley-Davidson | 2024 | Hydra-Glide Revival FLI |
| Harley-Davidson | 2018–2019 | Low Rider FXLR |
| Harley-Davidson | 2020–2024 | Low Rider S FXLRS |
| Harley-Davidson | 2021 | Slim FLSL |
| Harley-Davidson | 2019 | Softail Slim FLSL |
| Harley-Davidson | 2020–2023 | Softail Standard FXST |
| Harley-Davidson | 2018–2024 | Sport Glide FLSB |
| Harley-Davidson | 2025 | Street Bob FXBB |
| Harley-Davidson | 2021–2024 | Street Bob 114 FXBBS |
| Harley-Davidson | 2018–2020 | Street Bob FXBB |
Touring 23 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 2023 | Electra Glide Highway King FLHFB |
| Harley-Davidson | 2020 | Electra Glide Standard FLHT |
| Harley-Davidson | 2017–2019 | Electra Glide Ultra Classic FLHTCU |
| Harley-Davidson | 2021 | Revival FLH |
| Harley-Davidson | 2023 | Road Glide Anniversary FLTRXSANV |
| Harley-Davidson | 2017–2023 | Road Glide FLTRX |
| Harley-Davidson | 2021–2024 | Road Glide Limited FLTRK |
| Harley-Davidson | 2017–2023 | Road Glide Special FLTRXS |
| Harley-Davidson | 2017–2018 | Road Glide Ultra FLTRU |
| Harley-Davidson | 2017 | Road King Classic FLHRC |
| Harley-Davidson | 2017–2021 | Road King FLHR |
| Harley-Davidson | 2025 | Road King Special FLHRXS |
| Harley-Davidson | 2017–2024 | Road King Special FLHRXS |
| Harley-Davidson | 2018 | Street Glide Anniversary FLHX |
| Harley-Davidson | 2017–2023 | Street Glide FLHX |
| Harley-Davidson | 2018 | Street Glide Special Anniversary FLHXS |
| Harley-Davidson | 2017–2023 | Street Glide Special FLHXS |
| Harley-Davidson | 2018 | Ultra Limited Anniversary FLHTK |
| Harley-Davidson | 2023 | Ultra Limited Anniversary FLHTKANV |
| Harley-Davidson | 2017–2024 | Ultra Limited FLHTK |
| Harley-Davidson | 2017–2019 | Ultra Limited Low FLHTKL |
| Harley-Davidson | 2018–2023 | Ultra Limited Shrine Edition FLHTK |
| Harley-Davidson | 2017 | Ultra Limited Shrine FLHTK |
Trike 8 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 2025 | Freewheeler FLRT |
| Harley-Davidson | 2017–2023 | Freewheeler FLRT |
| Harley-Davidson | 2025 | Road Glide 3 FLTRT |
| Harley-Davidson | 2023 | Road Glide 3 FLTRT |
| Harley-Davidson | 2025 | Tri Glide ULTRA FLHTCUTG |
| Harley-Davidson | 2018 | Tri Glide Ultra Anniversary FLHTCUTG |
| Harley-Davidson | 2023 | Tri Glide Ultra Anniversary FLHTCUTGANV |
| Harley-Davidson | 2017–2024 | Tri Glide Ultra FLHTCUTG |
Planning other changes? Find your model in the bike customiser.
Related Products
View all →
KB Performance Piston
1200 XL piston kit. STD
KB Performance Piston
1340cc Evo B.T. piston kit. +.020"
KB Performance Piston
96"/103" to 110" Twin Cam piston kit. +.020"
KB Performance Piston
1200 XL piston kit. +.030"
KB Performance Piston
1200 XL piston kit. +.005"
KB Performance Piston
1200cc B.T. piston kit. +.005"
KB Performance Piston
1200cc B.T. piston kit. +.030"
KB Performance Piston
1340cc Shovel piston kit. +.010"
More from S&S
View all →
Non-adj. aluminum pushrod set for Knuckle
00-06 Softail 4-5/8" stroke flywheel assembly
Adapter for screw-on oil filter
Flanged screw. cam drive gear sprocket retention
Rear belt XN7 carbon cord. 14mm, 1-1/8", 130t
Rear belt XN7 carbon cord. 14mm, 1-1/8", 133t
06-17 4-1/8" stroke flywheel assembly
54-E77 B.T. pinion shaft gear kit. White
Who are we? Leeds Harley-Davidson - Iron City Motorcycles
This product is fulfilled by Iron City Motorcycles, Leeds' authorised Harley-Davidson® dealer, serving the UK with a full range of Genuine Motorclothes®, dealer merchandise, and official Harley-Davidson parts & accessories — available for UK and international delivery.
From OEM Parts to retro lifestyle wear to aftermarket stockits we have what you need to keep you riding all year round.
Use our official OEM parts finder to browse our full Genuine Harley-Davidson® Parts and our associated approved aftermarket catalogues.