# S&S Cycle 70-84 BT 4-1/4in Stroke Flywheel Assembly

This 4-1/4" stroke 8-1/2" diameter flywheel assembly replaces the original flywheels in S&S® 80" SH80 engines with alternator style crankcases for 1970-'84 HD® big twins.

-   Flywheels are CNC machined from heat-treated, closed die, steel forgings, and are stronger than cast iron or late style steel flywheels
-   Dynamically balanced and fully assembled with premium quaility S&S® mainshafts and heavy duty 7.440" connecting rods
-   May also be used in 88" engines with 3-5/8" bore cylinders

This Part Fits:

Year

Make

Model

Submodel

1980-1984

Harley-Davidson

FLHS Electra Glide Sport

Base

1980-1983

Harley-Davidson

FLT Tour Glide

Base

1982-1984

Harley-Davidson

FXRS Low Glide

Base

1983-1984

Harley-Davidson

FXRT Sport Glide

Base

1977-1982

Harley-Davidson

FXS Low Rider

Base

1983-1984

Harley-Davidson

FXSB Low Rider - Belt

Base

1984

Harley-Davidson

FXST Softail Standard

Base

1980-1984

Harley-Davidson

FXWG Wide Glide

Base

## Details

- **Price:** 2287.28 CAD
- **Vendor:** S&S Cycle
- **Type:** Flywheels

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2287.28 CAD | In stock |

## Images

- Photo - Primary
- User 1

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-70-84-bt-4-1-4in-stroke-flywheel-assembly)
> Updated: 2026-07-13