Keith Black KB305.020 80-Inch Evolution Piston Kit .020 Oversize

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 features a .020-inch oversize piston designed for a 3.498-inch bore and a 9.5:1 compression ratio. The piston uses a hypereutectic alloy cast in a permanent steel mold, supporting a lightweight design intended to help produce more power, use less fuel, and provide extended service life.

Its low-heat-transfer alloy helps keep the skirts cooler and minimizes piston expansion. Combined with high compression ring placement, this design supports increased power and economy. The high ring placement also helps reduce detonation and raises the top ring temperature.

This kit fits 1984–1993 Harley-Davidson FXR models. New pistons and rings should be broken in by running the engine at moderate speeds for at least 500 miles while avoiding excessive operation in lower gears. The product data lists the unit of measure as a set and identifies Mexico as the country of origin. Keith Black part number KB305.020 is included for product identification.

Features:

• Brand: Keith Black
• Part Number: KB305.020
• Application: 80-inch Evolution piston kit
• Oversize: .020-inch oversize
• Bore: Designed for a 3.498-inch bore
• Compression Ratio: 9.5:1
• Material: Hypereutectic alloy
• Construction: Cast in a permanent steel mold
• Design: Low-heat-transfer alloy helps minimize piston expansion
• Ring Placement: High compression ring placement
• Fitment: 1984–1993 Harley-Davidson FXR models
• Break-In: Run at moderate speeds for at least 500 miles and avoid excessive operation in lower gears
• Accessory Items: 16-0622 - Ring-O-Matic Ring Compressor Tool Kit, 60-0167, 16-0075 - Wrist Pin Ring Tool

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