Keith Black KB305.005 80-Inch Evolution Piston Kit .005 Oversize

Keith Black piston set is .005 oversize with a 9.6:1 compression ratio for 1984-up Big Twin Evolution models.

The Keith Black KB305.005 80-inch Evolution Piston Kit is designed with a .005-inch oversize 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 construction intended to help produce more power, improve fuel economy, and promote durability.

The alloy’s low heat transfer helps keep the skirts cooler and minimizes piston expansion. High compression ring placement is designed to support increased power and economy while reducing detonation and increasing top ring temperature. This kit fits 1984–1993 Harley-Davidson FXR models as listed in the product data.

New pistons and rings should be properly broken in by running the engine at moderate speeds for at least 500 miles and avoiding excessive operation in lower gears. The product is supplied as a set. Country of origin: Mexico. Manufacturer instructions are referenced in the product data.

Brand: Keith Black. Part number: KB305.005.

Features:

• Construction: Hypereutectic alloy piston cast in a permanent steel mold
• Oversize: .005 inch oversize for a 3.498-inch bore
• Compression Ratio: 9.5:1
• Heat Management: Low heat transfer alloy helps keep the skirts cooler and minimizes expansion
• Ring Placement: High compression ring placement is designed to reduce detonation and increase top ring temperature
• Fitment: Fits 1984–1993 Harley-Davidson FXR models listed in the product data
• Unit of Measure: Set
• Country of Origin: Mexico

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