# S&S Cycle 2007+ BT 4.250in Bore 4.840in - Wrinkle Black w/o Highlight

S&S has been building big bore kits since the 60s and has it down to an absolute science. Our latest efforts are aimed at the Milwaukee Eight® platform (2017 and newer big twins) and open up a whole new level of performance for these engines. Combining a new design forged piston with their 4.25" cylinders to net a tire melting 131 cubic inches when paired with their 4.625" stroker crank. We build our big bore kits and cranks to much tighter tolerarances and with higher quality materials than the factory parts. This new piston/cylinder kit will be a solid platform for massive power.

-   Must be used with our stroker flywheels to achieve 131" displacement (part #s 320-0605, 320-0620)
-   Powder coat finish match factory finish, giving the bike a "sleeper" advantage
-   Huge displacement increase means huge power increase
-   .030" MLS (multi-layered steel) head gaskets
-   Original engine serial numbers are retained
-   Includes 131" Cam Cover Badge
-   Works with stock crankcases
-   Retains stock engine height

This Part Fits:

Year

Make

Model

Submodel

2018-2020

Harley-Davidson

FLDE Deluxe 107

Base

2018-2020

Harley-Davidson

FLFBS Fat Boy 114

Base

2018-2020

Harley-Davidson

FLHCS Heritage Classic 114

Base

2017-2020

Harley-Davidson

FLHR Road King

Base

2017-2020

Harley-Davidson

FLHRXS Road King Special

Base

2019-2020

Harley-Davidson

FLHT Electra Glide Standard

Base

2017-2019

Harley-Davidson

FLHTCU Electra Glide Ultra Classic

Base

2020

Harley-Davidson

FLHTCUTGSE CVO Tri Glide

Base

2017-2020

Harley-Davidson

FLHTK Ultra Limited

Base

2017-2019

Harley-Davidson

FLHTKL Ultra Limited Low

Base

2017-2020

Harley-Davidson

FLHTKSE CVO Limited

Base

2017-2020

Harley-Davidson

FLHX Street Glide

Base

2017-2020

Harley-Davidson

FLHXS Street Glide Special

Base

2017-2020

Harley-Davidson

FLHXSE CVO Street Glide

Base

2017-2020

Harley-Davidson

FLRT Freewheeler

Base

2020

Harley-Davidson

FLTRK Road Glide Limited

Base

2017-2019

Harley-Davidson

FLTRU Road Glide Ultra

Base

2017-2020

Harley-Davidson

FLTRX Road Glide

Base

2017-2020

Harley-Davidson

FLTRXS Road Glide Special

Base

2018-2020

Harley-Davidson

FXBRS Breakout 114

Base

2019-2020

Harley-Davidson

FXDRS FXDR 114

Base

2018-2020

Harley-Davidson

FXFBS Fat Bob 114

Base

2020

Harley-Davidson

FXLRS Low Rider S 114

Base

## Details

- **Price:** 2175.75 CAD
- **Vendor:** S&S Cycle
- **Type:** Piston Sets - Powersports

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2175.75 CAD | In stock |

## Images

- Photo - Primary
- Photo - Primary
- User 1

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-2007-bt-4-250in-bore-4-840in-wrinkle-black-w-o-highlight)
> Updated: 2026-07-01