Keith Black KB297.040 80 Inch FLH-FX Piston Set .040 Oversize

Keith Black piston set is .040 oversize and is for a 3.498″ inch bore. Piston set has a compression of 8.3:1 and includes rings.

The Keith Black KB297.040 80 inch FLH-FX Piston Set .040 Oversize is made from a hypereutectic alloy cast in a permanent steel mold. This construction supports a lightweight piston design intended to make more power, use less fuel, and provide extended service life. The pistons are .040 oversize for a 3.498-inch bore and have a 9.5:1 compression ratio.

The alloy’s low heat transfer helps keep the skirts cooler and minimizes piston expansion. Combined with high compression ring placement, this design is intended to increase power and economy. High ring placement also helps reduce detonation and increases top ring temperature. This set fits 1978–1984 Harley-Davidson FL models and 1978–1980 Harley-Davidson FX models.

For proper break-in, run the engine at moderate speeds for at least 500 miles and avoid excessive operation in lower gears. Refer to the Keith Black Symmetrical-Asymmetrical Piston Installation Guide for installation information.

Features:

• Brand and Part Number: Keith Black KB297.040
• Application: 80 inch FLH-FX piston set
• Oversize: .040 oversize for a 3.498-inch bore
• Compression Ratio: 9.5:1
• Material: Hypereutectic alloy cast in a permanent steel mold
• Heat Management: Low heat transfer helps keep piston skirts cool and minimize expansion
• Ring Placement: High compression ring placement is intended to increase power and economy, reduce detonation, and increase top ring temperature
• Fitment: 1978–1984 Harley-Davidson FL and 1978–1980 Harley-Davidson FX models
• Break-In: Run at moderate speeds for at least 500 miles and avoid excessive running in lower gears
• Accessory Items: 16-0622 - Ring-O-Matic Ring Compressor Tool Kit, 16-0029 - Connecting Rod Clamping Tool, 60-0167

Fitment:
Harley Davidson FL 1978
Harley Davidson FL 1979
Harley Davidson FL 1980
Harley Davidson FL 1981
Harley Davidson FL 1982
Harley Davidson FL 1983
Harley Davidson FL 1984
Harley Davidson FLT 1979
Harley Davidson FLT 1980
Harley Davidson FLT 1981
Harley Davidson FLT 1982
Harley Davidson FLT 1983
Harley Davidson Fx 1978
Harley Davidson Fx 1979
Harley Davidson Fx 1980
Harley Davidson Fx 1981
Harley Davidson Fx 1982
Harley Davidson Fx 1983
Harley Davidson Fx 1984
Harley Davidson FXR 1982
Harley Davidson FXR 1983