Keith Black KB263.040 74 inch FLH-FX Piston Set .040 Oversize

Keith Black 390 hypereutectic piston set is .040 oversize and is for 3.438 inch bore. Pistons have a compression of 9.0:1.

The Keith Black KB263.040 74 inch FLH-FX Piston Set .040 Oversize is designed for the listed 1941–1950 Harley-Davidson FL applications. This piston set is supplied as a set and is identified by part number KB263.040.

Proper break-in is important for new pistons and rings. Run the engine at moderate speeds for at least 500 miles while avoiding excessive running in lower gears. Refer to the Keith Black piston installation guide for installation information.

A suggested 74 inch moly piston ring set .040 oversize is listed separately under part number 11-1372. Accessory items listed for this product include the Ring-O-Matic Ring Compressor Tool Kit, Connecting Rod Clamping Tool, and item 60-0167.

Features:

• Brand: Keith Black
• Part Number: KB263.040
• Application: 74 inch FLH-FX
• Oversize: .040 oversize
• Product Type: Piston set
• Fitment: 1941–1950 Harley-Davidson FL
• Unit of Measure: Set
• Country of Origin: Mexico
• Break-In Guidance: Run the engine at moderate speeds for at least 500 miles while avoiding excessive running in lower gears

Fitment:
Harley Davidson FL 1941
Harley Davidson FL 1942
Harley Davidson FL 1943
Harley Davidson FL 1944
Harley Davidson FL 1945
Harley Davidson FL 1946
Harley Davidson FL 1947
Harley Davidson FL 1948
Harley Davidson FL 1949
Harley Davidson FL 1950
Harley Davidson FL 1951
Harley Davidson FL 1952
Harley Davidson FL 1953
Harley Davidson FL 1954
Harley Davidson FL 1955
Harley Davidson FL 1956
Harley Davidson FL 1957
Harley Davidson FL 1958
Harley Davidson FL 1959
Harley Davidson FL 1960
Harley Davidson FL 1961
Harley Davidson FL 1962
Harley Davidson FL 1963
Harley Davidson FL 1964
Harley Davidson FL 1965
Harley Davidson FL 1966
Harley Davidson FL 1967
Harley Davidson FL 1968
Harley Davidson FL 1969
Harley Davidson FL 1970
Harley Davidson FL 1971
Harley Davidson FL 1972
Harley Davidson FL 1973
Harley Davidson FL 1974
Harley Davidson FL 1975
Harley Davidson FL 1976
Harley Davidson FL 1977
Harley Davidson Fx 1971
Harley Davidson Fx 1972
Harley Davidson Fx 1973
Harley Davidson Fx 1974
Harley Davidson Fx 1975
Harley Davidson Fx 1976
Harley Davidson Fx 1977