S&S Flywheel Assembly for Evolution Engines S&S Flywheel Assembly
- This 4-1/4" stroke 8-1/2" diameter flywheel assembly replaces the original flywheel in Evolution engines
- 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 quality S&S mainshafts and heavy duty 7.44" connecting rods
- Made in the USA
Made of high strength forged steel, S&S flywheels are recommended for both stock replacement and high performance custom applications alike.
Features and Benefits:
- Drive side flywheels have special keyed 6 degree large diameter taper that provides more contact area, increasing strength
- Standard S&S tapered crankpin and pinion shaft are used for ease of service
- 8-1/2" diameter with 4-1/4" stroke
- 1990-1999 Evolution engines require S&S Pinion Shaft Conversion Kit 33-4148 to complete installation (sold separately)
- Made in the USA
Product Note: 1990-1999 Evolution Big Twin require S&S Pinion Shaft Conversion Kit 33-4148 to complete installation, (sold separately).
| Specification | Details |
|---|---|
| Country of Origin | USA |
| Diameter | 8-1/2 in. |
| Engine Type | Evolution Big Twin |
| Material | Steel |
| OEM Reference | Varies (make selection above) |
| Stroke | 4.25 in. |
| Country of Origin | USA |
| Diameter | 8-1/2 in. |
| Engine Type | Evolution Big Twin |
| Material | Steel |
| OEM Reference | 23906-90 / 23906-93B / 23906-90A |
| Stroke | 4.25 in. |
Vehicle Fitment
Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.
Harley Davidson
Harley Davidson
- CVO FXR2 1999
- CVO FXR3 1999
- FLH Electra Glide 1984-1985
- FLHR Electra Glide Road King 1994
- FLHR Road King 1995-1999
- FLHS Electra Glide Sport 1984-1993
- FLHT Electra Glide 1986-1987
- FLHT Electra Glide Standard 1995-1999
- FLHTC Electra Glide Classic 1984-1999
- FLHTC Liberty Electra Glide Classic Liberty 1986
- FLHTCU Ultra Classic Electra Glide 1989-1998, 2000
- FLHX Electra Glide Special 1984-1985
- FLST Heritage Softail 1986-1990
- FLSTC Heritage Softail Classic 1988-1999
- FLSTF Softail Fat Boy 1990-1999
- FLSTN Heritage Softail Nostalgia 1993
- FLSTN Heritage Softail Special 1994-1996
- FLSTS Heritage Springer Softail 1997-1999
- FLTC Tour Glide Classic 1984-1991
- FLTCU Ultra Classic Tour Glide 1989-1995
- FLTR Road Glide 1998-1999
- FXD Dyna Super Glide 1995-1999
- FXDB Dyna Daytona 1992
- FXDB Dyna Sturgis 1991
- FXDC Dyna Glide Custom 1992
- FXDL Dyna Low Rider 1993-1999
- FXDS-CONV Dyna Convertible 1994, 1999
- FXDWG Dyna Wide Glide 1993-1999
- FXE Super Glide 1984
- FXEF Super Glide Fat Bob 1985
- FXLR Low Rider Custom 1987-1994
- FXR Super Glide 1986-1994
- FXRC Low Glide 1985
- FXRC Low Rider Chrome 1987
- FXRD Grand Touring Edition 1986
- FXRDG Disc Glide 1984
- FXRS Low Glide 1984-1992
- FXRS-CONV Low Rider Convertible 1990-1993
- FXRS-SP Low Rider Sport Edition 1987-1993
- FXRT Sport Glide 1984-1992
- FXSB Low Rider 1984-1985
- FXST Softail 1984-1990
- FXST Softail Standard 1999
- FXSTB Softail Night Train 1999
- FXSTC Softail Custom 1986-1999
- FXSTS Springer Softail 1988-1999
- FXSTSB Softail Bad Boy 1995-1997
- FXWG Wide Glide 1984-1986
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