Keith Black KB266.030 80-Inch Evolution Domed Piston Kit .030

Keith Black dome piston set is .030 oversize with a 10.5:1 compression ratio for 1984-up Big Twin Evolution models.

The Keith Black KB266.030 80-inch Evolution Domed Piston Kit is made from a hypereutectic alloy cast in a permanent steel mold. This construction supports a lightweight piston design intended to deliver increased power, improved fuel economy, and extended service life. The piston is .030 oversized for a 3.498-inch bore and provides a 10.5:1 compression ratio.

The alloy’s low heat transfer helps keep the skirts cooler and minimizes piston expansion. High compression ring placement contributes to increased power and economy while helping reduce detonation and raise top ring temperature. This kit is listed for 1984–1993 Harley-Davidson FXR models.

For proper break-in, run the engine at moderate speeds for at least 500 miles and avoid excessive operation in lower gears. The product data identifies this item as a set and lists Mexico as its country of origin. The Keith Black part number for this piston kit is KB266.030.

Features:

• Construction: Hypereutectic alloy piston cast in a permanent steel mold
• Bore Size: .030 oversized for a 3.498-inch bore
• Compression Ratio: 10.5:1
• Piston Design: Domed piston for 80-inch Evolution applications
• Heat Management: Low heat transfer alloy helps keep the skirts cool and minimize expansion
• Ring Placement: High compression ring placement helps reduce detonation and increase top ring temperature
• Break-In Requirement: Run at moderate speeds for at least 500 miles while avoiding excessive running in lower gears
• Fitment: Listed for 1984–1993 Harley-Davidson FXR models

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