# S&S Cycle 84-99 BT Forged 3 5/8in Bore .020in Piston Kits

These forged, 3-5/8" big bore flat topped pistons are used in S&S® Sidewinder® kits and Hot Set Up Kits® for HD® Evolution® big twins with stock cylinder heads and 4-1/4" and 4-1/2"stroke engines with stock diameter (8-1/2") flywheels and 4-3/4" stroke engines with 8-1/4" diameter flywheels. 3-5/8" bore.

This Part Fits:

Year

Make

Model

Submodel

1997-1999

Harley-Davidson

FLHR Road King

Base

1998-1999

Harley-Davidson

FLHRCI Road King Classic

Base

1996-1997

Harley-Davidson

FLHRI Road King

Base

1984,1987-1993

Harley-Davidson

FLHS Electra Glide Sport

Base

1996-1999

Harley-Davidson

FLHTCI Electra Glide Classic

Base

1989-1997

Harley-Davidson

FLHTCU Electra Glide Ultra Classic

Base

1986-1990

Harley-Davidson

FLST Heritage Softail

Base

1988-1999

Harley-Davidson

FLSTC Heritage Softail Classic

Base

1990-1999

Harley-Davidson

FLSTF Fat Boy

Base

1994-1996

Harley-Davidson

FLSTN Heritage Softail Special

Base

1998-1999

Harley-Davidson

FLTR Road Glide

Base

1998-1999

Harley-Davidson

FLTRI Road Glide

Base

1995-1999

Harley-Davidson

FXD Dyna Super Glide

Base

1993-1999

Harley-Davidson

FXDL Dyna Low Rider

Base

1993-1999

Harley-Davidson

FXDWG Dyna Wide Glide

Base

1987-1994

Harley-Davidson

FXLR Low Rider Custom

Base

1999

Harley-Davidson

FXR2

Base

1999

Harley-Davidson

FXR3

Base

1984-1992

Harley-Davidson

FXRS Low Glide

Base

1984-1992

Harley-Davidson

FXRT Sport Glide

Base

1984-1999

Harley-Davidson

FXST Softail Standard

Base

1986-1999

Harley-Davidson

FXSTC Softail Custom

Base

1988-1999

Harley-Davidson

FXSTS Springer Softail

Base

1995-1997

Harley-Davidson

FXSTSB Bad Boy

Base

1984-1986

Harley-Davidson

FXWG Wide Glide

Base

## Details

- **Price:** 695.98 CAD
- **Vendor:** S&S Cycle
- **Type:** Piston Sets - Powersports

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 695.98 CAD | In stock |

## Images

- Photo - Primary

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/s-s-cycle-84-99-bt-forged-3-5-8in-bore-020in-piston-kits)
> Updated: 2026-07-13