Keith Black 390 Hypereutectic 1000cc Piston Set.020 Oversize for Harley-Davidson XL (1972-1985)

Keith Black dome piston set is.020 oversize for Harley-Davidson XL 1000cc engines from 1972 through 1985, with a bore of 3.188 inches. This kit is designed to boost power output and fuel efficiency while sustaining reliability under harsh riding conditions.

• Hypereutectic alloy construction for strength and heat resistance
• Cast in a permanent steel mold for precise dimensions
• Lightweight design increases power and reduces fuel consumption
• Low heat transfer alloy keeps piston skirts cool, minimizing expansion
• High ring placement reduces detonation and enhances compression
• .020 oversize pistons designed for a 3.188 inch bore
• Fits Harley-Davidson XL models 1972-1985
• Includes all necessary components for installation; comprehensive installation instructions available
• Pistons proudly made in the USA

Proper break-in is essential; run at moderate speeds for at least 500 miles and avoid excessive low gear operation to ensure optimal piston and ring seating. This kit is intended for rebuilding or upgrading XL engines and supports durable performance for serious riders.

Keith Black dome piston set is.020 oversize with a 8.2 compression ratio for 1972-1985 XL 1000cc models.

Upgrade your Harley Davidson XL engine with the Keith Black 390 hypereutectic alloy piston set, designed for optimal performance and durability. Cast in a permanent steel mold, these pistons feature a lightweight construction that enhances power output while reducing fuel consumption. With a bore size of 3.188 inches and a 9:1 compression ratio, they are engineered to deliver improved efficiency and longevity. The low heat transfer alloy keeps the piston skirts cool, minimizing expansion and maintaining proper clearance under load. This combination of materials and design increases power and fuel economy while ensuring reliable operation over time.
These pistons are.020 oversize, fitting engines with a bore of approximately 3.188 inches, making them ideal for rebuilding or upgrading Harley Davidson XL models from 1972 through 1981. The high ring placement reduces the risk of detonation and enables higher compression ratios, further boosting performance. Proper break-in is essential; running the engine at moderate speeds for at least 500 miles and avoiding excessive low gear operation will help ensure optimal piston and ring seating. Comprehensive installation instructions are available at the provided link, supporting a smooth replacement process.
This set includes all necessary components for installation, and additional accessory tools are recommended for optimal results. The Keith Black pistons are proudly made in the USA, guaranteeing quality and craftsmanship for your motorcycle rebuild or upgrade. Enhance your Harley Davidson XL's performance with these durable, high-quality pistons, designed for serious riders seeking reliable power and efficiency.

Features:

• Hypereutectic alloy construction for strength and heat resistance

• Cast in a permanent steel mold for precise dimensions

• Lightweight design increases power and reduces fuel consumption

• Low heat transfer alloy keeps piston skirts cool, minimizing expansion

• High ring placement reduces detonation and enhances compression

• Fits Harley Davidson XL models from 1972 to 1981

• Includes.020 oversize pistons for improved bore fit

• Designed for optimal performance and longevity

Fitment:
Harley Davidson XL 1972
Harley Davidson XL 1973
Harley Davidson XL 1974
Harley Davidson XL 1975
Harley Davidson XL 1976
Harley Davidson XL 1977
Harley Davidson XL 1978
Harley Davidson XL 1979
Harley Davidson XL 1980
Harley Davidson XL 1981
Harley Davidson XL 1982
Harley Davidson XL 1983
Harley Davidson XL 1984
Harley Davidson XL 1985