Look for the serial number on the lower portion of the engine, which is called the crankcase. Newer Honda models (1990 and above) often have it stamped on the rear of the crankcase, usually close to the swing arm pivot point. Older models (earlier than1990) may have it stamped on the lower left or lower right section of the crankcase. @ = May have an Alpha designator in frame number 1 The frame number on most CT70 models is located on the frame, directly above the front drive sprocket. If you read CT70-xxxxxx you have a three-speed automatic and if you read CT70H-xxxxxxx you have a manual clutch model. 2 All frame numbers over 2500004 are noted by year.
There are two tables listed here. The first is 'Frame ID Numbers - 1981 and Later.' This information was originally posted (13 Mar 1996) by Dan Kloch(kloch@nrcdec.nrc.state.ne.us)
and was then updated (13 Nov 1996) by Cheezie to include 1993-96 bikes. The second table is 'Motorcycle ID Numbers 1970-1980.' And was added by Dan on 22 Nov 1996. Thanks to those busy guys!
Frame ID Numbers - 1981 and Later
Example: 1HD1AAK11BYO13478
The frame number is broken
down like this:
1 HD 1 AA K 1 1 B Y 013278
1 = Made in U.S.A.
HD = Harley Davidson
1 = Weight Class
1 = Heavyweight
4 = Lightweight
8 = Sidecar
AA = Model Designation
K = Engine Displacement
K = 1340 Shovelhead
H = 1000 Ironhead XL
L = 1340 Evolution
M = 883 Evolution XL
N = 1100 Evolution XL
P = 1200 Evolution XL
1 = Introdution Date
1 = Regular Introdution
2 = Mid-Year (January)
3 = California Special
4 = Daytona (March)
1 = Check Digit
B = Model Year
B = 1981 C = 1982
D = 1983 E = 1984
F = 1985 G = 1986
H = 1987 J = 1988
K = 1989 L = 1990
M = 1991 N = 1992
P = 1993 R = 1994
S = 1995 T = 1996
U = 1997
Y = Plant of Manufacture (York, PA)
T = Plant of Manufacture (Tomahawk, WI)
J = Plant of Manufacture (Milwaukee, WI)
013278 = Sequential Number
FL/FX Models
AA FLH - 80
AB FLHP - 80 Chain
AC FLH - 80 Shrine Chain
AD FLH - Classic
AG FLH - Classic w/ sidecar
AH FLHP - 80 Belt Deluxe
AJ FLH - 80 Heritage
AK FLHS - 80
AL FLH - 80 Shrine Belt
BA FXE - 80
BB FXEF - 80
BC FXS - 80
BD FXB - 80
BE FXWG - 80
BF FXSB - 80
BG FXDG
BH FXST
BJ FLST/FLSTC
BK FXSTC
BL FXSTS
BM FLSTF
BN FLSTN
BP FXSTSB
FLT/FXR Police Models
DA FLHTP - Windshield 1984 and later
DF FLHTP - Fairing
ED FXRP - Windshield
EF FXRP - Fairing
EK FXRP - C.H.P.
Motorcycle Engine Serial Number Check
FLT/FXR Models
AE 1981 FLT
AF 1981 FLTC
DA FLT 1982 and 1983 only
DB FLTC
DC FLHT
DD FLHTC
DE FLHTC w/ Sidecar
DG FLHTC Shrine
DH FLTC w/Sidecar
DJ FLHTC 1986 - present
DK FLTC Shrine
DM FLTCU - Ultra
DN FLTCU - Ultra w/Sidecar
DP FLHTCU - Ultra
DR FLHTCU - Ultra w/Sidecar
DS FLTCU - Ultra Shrine
DT FLHTCU - Ultra Shrine
EA FXR
EB FXRS
EC FXRT
EE FXRDG
EG FXRS-SP Sport Edition
EH FXRD
EJ FXRC
EL FXLR
EM FXRS - CON
FA FLHS
FB FLHR-I Injected
FC FLHTCU-I Injected
FD FLHR
FE FLTCU-I Injected
FF FLHTC-I Injected