Crankcase Identification Numbers

Crankcase Identification Numbers

Numbers located on both left and right crankcase halves.

Big Twin: Left Case - Outside, Lower Front

Right Case - Inside, Gearcase Compartment

XL Models: Left Case - Inside, Primary Compartment

Right Case - Outside, Near Oil Pump

Stamped at Capitol Drive Facility

Used to identify engine and track production changes

Example: 1588 321 007
1590 158 080

15 = Engine Designation

1 = 1200cc Shovelhead

7 = 1000cc Iron XL

14 = 1340cc Shovelhead

15 = 1340cc Evolution

16 = XR-1000

17 = 883cc Evolution XL

18 = 1100cc Evolution XL

19 = 1200cc Evolution XL

20 = 1340cc Evolution, California (1988 - *)

21 = 883cc Evolution XL, California (1988 - *)

22 = 1200cc Evolution XL, California (1988 - *)

88 = Model Year

90 = Model Year

321 = Day of Production

001 = Jan. 1st 182 = Jul. 1st

032 = Feb. 1st 213 = Aug. 1st

060 = Mar. 1st 244 = Sep. 1st

091 = Apr. 1st 274 = Oct. 1st

121 = May 1st 305 = Nov. 1st

152 = Jun. 1st 335 = Dec. 1st

158 = Jun. 7th

007 = Number That Day

080 = Dus de 80ste die dag