This special crankpin is identical to the JIMS 506870 crankpin but are ground shorter, -.025" from taper to taper, for engine builders that prefer less connecting rod end play. Standard O.D. 1.2490". 3-hole oil design. Use Jims 978251 crankpin nuts. Use Jims 978618 (Repl. 23985-18) woodruff keys. Custom replacement crankpin for OEM 23961-41.
Fits: > 41-E81 Big Twin (Excl. 61" Knuckle, 61" Panhead & all Flatheads) (NU)
