Keith Black piston set is .020 oversize and is for 3.498 inch bore. Piston set has a compression of 9.6:1 and includes rings.
The Keith Black KB305.020 80-inch Evolution Piston Kit is designed with a .020-inch oversize piston for a 3.498-inch bore and a 9.5:1 compression ratio. The hypereutectic alloy is cast in a permanent steel mold to produce a lightweight piston intended to support increased power, improved fuel economy, and long service life.
The alloy's low heat transfer helps keep the skirts cooler, minimizing piston expansion. High compression ring placement is designed to increase power and economy while helping reduce detonation and increase top-ring temperature.
This piston kit fits 1984 through 1993 Harley-Davidson FXR models. New pistons and rings should be broken in by operating the engine at moderate speeds for at least 500 miles and avoiding excessive operation in lower gears. Refer to the Keith Black conversion piston guide and fitment document for installation information.
The kit is supplied as a set. A compatible 80-inch Shovelhead .020 piston ring set is listed as a suggested item, while ring installation tools are listed as accessory items.
Features:
- Brand: Keith Black
- Part Number: KB305.020
- Piston Type: Hypereutectic alloy
- Bore Size: .020-inch oversize for a 3.498-inch bore
- Compression Ratio: 9.5:1
- Construction: Cast in a permanent steel mold
- Ring Placement: High compression ring placement
- Fitment: 1984–1993 Harley-Davidson FXR models
- Unit of Measure: Set
- Break-In Requirement: Run at moderate speeds for at least 500 miles and avoid excessive running in lower gears
Fitment
Harley Davidson FLST 1986
Harley Davidson FLST 1987
Harley Davidson FLST 1988
Harley Davidson FLST 1989
Harley Davidson FLST 1990
Harley Davidson FLST 1991
Harley Davidson FLST 1992
Harley Davidson FLST 1993
Harley Davidson FLST 1994
Harley Davidson FLST 1995
Harley Davidson FLST 1996
Harley Davidson FLST 1997
Harley Davidson FLST 1998
Harley Davidson FLT 1984
Harley Davidson FLT 1985
Harley Davidson FLT 1986
Harley Davidson FLT 1987
Harley Davidson FLT 1988
Harley Davidson FLT 1989
Harley Davidson FLT 1990
Harley Davidson FLT 1991
Harley Davidson FLT 1992
Harley Davidson FLT 1993
Harley Davidson FLT 1994
Harley Davidson FLT 1995
Harley Davidson FLT 1996
Harley Davidson FLT 1997
Harley Davidson FLT 1998
Harley Davidson FXD 1991
Harley Davidson FXD 1992
Harley Davidson FXD 1993
Harley Davidson FXD 1994
Harley Davidson FXD 1995
Harley Davidson FXD 1996
Harley Davidson FXD 1997
Harley Davidson FXD 1998
Harley Davidson FXR 1984
Harley Davidson FXR 1985
Harley Davidson FXR 1986
Harley Davidson FXR 1987
Harley Davidson FXR 1988
Harley Davidson FXR 1989
Harley Davidson FXR 1990
Harley Davidson FXR 1991
Harley Davidson FXR 1992
Harley Davidson FXR 1993
Harley Davidson FXR 1994
Harley Davidson FXST 1984
Harley Davidson FXST 1985
Harley Davidson FXST 1986
Harley Davidson FXST 1987
Harley Davidson FXST 1988
Harley Davidson FXST 1989
Harley Davidson FXST 1990
Harley Davidson FXST 1991
Harley Davidson FXST 1992
Harley Davidson FXST 1993
Harley Davidson FXST 1994
Harley Davidson FXST 1995
Harley Davidson FXST 1996
Harley Davidson FXST 1997
Harley Davidson FXST 1998
