Keith Black KB266.005 80-Inch Evolution Domed Piston Kit .005 Oversize

Keith Black dome piston set is .005 oversize with a 10.5:1 compression ratio for 1984-up Big Twin Evolution models.

The Keith Black KB266.005 80-inch Evolution Domed Piston Kit features hypereutectic alloy pistons cast in a permanent steel mold. This construction supports a lightweight piston design intended to help produce more power, improve fuel economy, and promote long service life. The pistons are .005 inch oversize for a 3.498-inch bore and have a 10.5:1 compression ratio.

The alloy's low heat transfer helps keep the skirts cooler, minimizing piston expansion. Combined with high compression ring placement, this design is intended to support power and economy. High ring placement also helps reduce detonation and increase top-ring temperature. This kit is listed for 1984–1993 Harley-Davidson FXR applications.

Keith Black recommends operating the engine at moderate speeds for at least 500 miles during break-in, while avoiding excessive running in lower gears, to properly seat new pistons and rings. Refer to the manufacturer's piston guide and fitment instructions before installation. The unit of measure is set.

Features:

• Brand: Keith Black
• Part Number: KB266.005
• Piston Type: 80-inch Evolution domed piston kit
• Oversize: .005 inch oversize for a 3.498-inch bore
• Compression Ratio: 10.5:1
• Material: Hypereutectic alloy
• Construction: Cast in a permanent steel mold
• Heat Management: Low heat transfer alloy helps minimize skirt expansion
• Ring Placement: High compression ring placement
• Fitment: 1984–1993 Harley-Davidson FXR
• Unit of Measure: Set

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