Keith Black KB305.010 80 Inch Evolution Piston Kit .010

Keith Black piston set .010 oversize and is for a 3.498 inch bore. Piston set has a compression ratio of 9.6:1 and includes rings.

The Keith Black KB305.010 80 inch Evolution Piston Kit .010 is designed for applications requiring a 3.498-inch bore and a 9.5:1 compression ratio. The hypereutectic alloy is cast in a permanent steel mold, supporting a lightweight piston design intended to deliver increased power, improved fuel economy, and extended service life.

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

For proper break-in, run the engine at moderate speeds for at least 500 miles and avoid excessive operation in lower gears. The kit is listed for 1984–1993 Harley-Davidson FXR applications. Keith Black part number KB305.010.

Features:

• Hypereutectic Alloy: Constructed from Keith Black hypereutectic alloy.
• Permanent Mold Casting: Cast in a permanent steel mold for a lightweight piston design.
• Bore Size: .010 oversize for a 3.498-inch bore.
• Compression Ratio: 9.5:1 compression ratio.
• Low Heat Transfer: Helps keep the skirts cooler and minimize piston expansion.
• High Ring Placement: Supports increased power and economy, helps reduce detonation, and increases top-ring temperature.
• Fitment: Fits 1984–1993 Harley-Davidson FXR models.
• Unit of Measure: Sold as a set.
• Break-In Requirement: Run the engine at moderate speeds for at least 500 miles and avoid excessive running in lower gears to properly break in new pistons and rings.

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