12-0839 - Oil Pump Body

Oil pump body is drilled and tapped for a 1/4 inch x 20 thread. The Harley Davidon oil pump 678-41A was originally used for 1946-1947 Knucklehead Big Twin engines and early Panhead models (1948-1950). It was later replaced by updated part numbers in the 1950s such as 26201-48 for Panheads (1948-1952). Although no modern chart exists compatibility and oil characteristics are well documented by classic motorcycle enthusiasts and suppliers.