Indian Motorcycle Serial Numbers, Model Data & Specs 1901-1953

date format  = day/month/year, e.g. 1/11/31 = 1st Nov 1931

Use Ctrl+F to 'Find', use first 3 digits only for serial searches

****** Bore and Stroke (BS) Data current; under development, use as guide only for the time being

 

Year

Model

Eng.Number

Cyls.

H.P

Bore

Stroke

Frame Number

Notes

1953

353

CS61001-CS62500+

2

 

 

CS61001-CS62500+

last batch of 53's where a large sequence of serials were skipped

1953

353

CS6501-CS6999

2

 

 

CS6501-CS6999

'Chief' 53, serials above 6500 accepted as 53 if registration supports.

1952

352

CS6001-CS6500

2

 

 

CS6001-CS6500

'Chief' 52, up to 6500 whether '52 or '53 may depend on registration?

1952

?

BB1001T-

2

 

 

B1001T-

'Warrior TT', last model year

1952

?

CS4001-

2

 

 

CS4001-

'Warrior', last model year, Warrior Patrols (3 wheeler for Police/FD)

1951

351

C4001-C4500

2

 

 

C4001-C4500

'Chief' 80ci, the last of the eighty's without yr confusion!

1951

651?

FEA101-?

2

 

 

FEA101-?

''Dispatch Tow' Scout, NYC Fire Dept Only?, note 14

1951

?

B1001T-

2

 

 

B1001T-

'Warrior TT', frame sequence continues thru '52

1951

?

B101-

2

 

 

B101-

'Warrior'

1950

350

C2001-C2500

2

 

 

C2001-C2500

'Chief' 80ci, 2nd series, #'s changed, C2441-C2500 to PDNYC Police

1950

350

CEJ1001-CEJ1500

2

 

 

3501001-3501500

'Chief' 80ci (1320cc), first year for  telescopic forks, 1st series

1950

?

BEJ1001-

2

 

 

2501001T-

'Warrior TT', 30.50ci (500cc)

1950

?

BEJ101-

2

 

 

250101-

'Warrior', 30.50ci (500cc)

1950

250

BBEJ1001-

2

 

 

22501001-

Scout', last model year

1950

150

AAEJ1001-

1

 

 

11501001-

Arrow', last model year

1949

349

CDI1001-

2

 

 

3491001-

Chief, very limited production, serials inflated

1949

249

BDI101-

2

 

 

249101-

Scout', 26ci, (440cc), first vertical twin

1949

149

ADI101-

1

 

 

149101-

Arrow', 13ci, (220cc), first vertical single

1948

348

CDH101-

2

 

 

348101-

Chief', new frame, new oil pump etc

1948

648

FDH101-150

2

 

 

648101-150

45" Daytona 'big base' Scout.  note 13

1947

347

CDG101-

2

 

 

347101-

'Chief', no other models

1946

346

CDF101-

2

 

 

346101-

'Chief', new girder forks, no other models

1945

345

CDE101-

2

 

 

345101-

'Chief' limited production,

1944

344

CDD101-

2

 

 

344101-

'Chief', no other models, all military?

1943

343

CDC101-

2

 

 

343101-

'Chief', very limited civilian production, last of 741's, high serials

1942

442

DDB101-

4

 

 

442101-

Indian 4, the last year of the 4ours...

1942

342

CDB101-

2

 

 

342101-

'Chief', 74ci

1942

642

FDB101-

2

 

 

642101-

45" 'Sport Scout', last year of the SS/SSDT, Daytona in '48

1942

542

EDB101-

2

 

 

542101-

30.50ci 'Junior Scout'

1941

441

DDA101-

4

 

 

441101-

Indian 4, 78ci

1941

341

CDA101-

2

 

 

341101-

'Chief', 74ci

1941

841

HDA101-

2

 

 

841101-

Military, 841, 45ci transverse, shaft drive

1941

641

FDA101-

2

 

 

641101-

45" 'Sport Scout' and DT's

1941

741

GDA101-

2

 

 

741101-

Military 741(b) lightweight 30.50ci note 6

1941

541

EDA101-

2

 

 

541101-

30.50ci 'Junior Scout'

1940

440

DDO101-

4

 

 

440101-

Indian 4, 78ci

1940

340

CAV101-

2

 

 

CAV101-

CAV=Continental Army Vehicle (aka Military Chief, Canadian)

1940

340

CDO101-

2

 

 

340101-

'Chief', incl Military, except Canada

1940

640

FDO101-

2

 

 

640101-

45" 'Sport Scout'  and Military 640 Scouts note 6

1940

540

EDO101-

2

 

 

540101-

30.50ci 'Scout Pony' renamed 'Thirty-Fifty'

1939

439

DCI101-

4

 

 

439101-

Indian 4

1939

339

CCI101-

2

 

 

339101-

'Chief' 74ci

1939

639

FCI101-

2

 

 

639101-

45" 'Sport Scout' and Dispatch Tows (DT)

1939

539

ECI101-

2

 

 

539101-

30.50ci 'Junior Scout'

1938

438

DCH101-

4

 

 

438101-

Indian 4, 78ci

1938

338

CCH101-

2

 

 

338101-

'Chief' 74ci

1938

638

FCH101-

2

 

 

638101-

45" 'Sport Scout' and Dispatch Tows

1938

538

ECH101-

2

 

 

538101-

30.50ci 'Junior Scout'

1937

437

DCG101-

4

 

 

437101-

Indian 4, 78ci

1937

337

CCG101-

2

 

 

337101-

'Chief' 74ci

1937

637

FCG101-

2

 

 

637101-

45" 'Sport Scout' and Dispatch Tows

1937

237

BCG101-

2

 

 

237101-

45" Std 'Scout' last model year

1937

537

ECG101-

2

 

 

537101-

30.50ci 'Junior Scout' renamed 'Scout Pony'

1936

436

DCF101-

4

 

 

436101-

Indian 4, 78ci

1936

336

CCF101-

2

 

 

336101-

'Chief' ,74ci

1936

636

FCF101-

2

 

 

636101-

45" 'Sport Scout' and Dispatch Tows

1936

236

BCF101-

2

 

 

236101-

45" Std 'Scout'

1936

536

ECF101-

2

 

 

536101-

30.50ci 'Junior Scout'

1935

435

DCE101-

4

 

 

435101-

Indian 4, 78ci

1935

335

CCE101-

2

 

 

335101-

'Chief' 74ci

1935

635

FCE101-

2

 

 

635101-

45" 'Sport Scout' and Dispatch Tows note 14

1935

235

BCE101-

2

 

 

235101-

45" Std 'Scout'

1935

535

ECE101-

2

 

 

535101-

30.50ci 'Junior Scout'

1934

434

DCD101-

4

 

 

434101-

Indian 4, 78ci

1934

334

CCD101-

2

 

 

334101-

'Chief' ,74ci

1934

634

FCD101-

2

 

 

634101-

45" 'Sport Scout', 1st yr with new keystone frame

1934

234

BCD101-

2

 

 

234101-

45" Std 'Scout' (still chief frame]

1934

534

ECD101-

2

5.0

 

 

534101-

30.50ci 'Junior Scout'

1933

433

DCC101-

4

 

 

433101-

Indian 4, 78ci (1278cc)

1933

333

CCC101-

2

 

 

333101-

'Chief' 74ci

1933

633

FCC101-

2

 

 

633101-

1yr only 45ci 'Motoplane' (in Jr Scout frame)

1933

233

BCC101-

2

 

 

233101-

45" Std 'Scout'

1933

533

ECC101-

2

5.0

 

 

533101-

30.50ci 'Junior Scout'

1932

403

DOC101-

4

 

 

403101-

Indian 4, 78ci

1932

EOC/503

EOC101-

2

5.0

2 1/2

3 1/16

503101-

'Junior' or 'Pony' Scouts begin, 30.5ci (500cc) 101 mo end

1932

COC/303

COC101-

2

8.5

3 1/4

4 7/16

303101-

Chief ,74"

1932

BOC/203

BOC101-

2

6.61

2 7/8

3 1/2 

203101-

Std 'Scout' 45" in Chief frame,

1931

HEP/302

EH1536-

2

8.45

3 1/4

4 7/16 

H1410-

Chief, 74"

1931

GP/101

EGP3081-

2

6.61

2 7/8

3 1/2

G4050

101 Scout 45", also first service car. [last year]

1931

G/101

EG925-

2

6.05

2 3/4

3 3/16 

SI346-

101 Scout 37", frame numbers continue note 9

1931

 402

EA776-EA1509

4

12.10

2 3/4

3 1/4

-none-

Indian 4, sequence continues to 11/1/31

1930

HEP/302

EH100-EH1535

2

8.45

3 1/4

4 7/16 

-none-

Chief 74", sequence continues to 11/1/31

1930

GP/101

EGP100-EGP3080

2

6.61

 

 

-none-

101 Scout 45" ,sequence continues 11/1/31

1930

G/101

EG100-EG924

2

6.05

 

 

none-SI322 note 9

101 Scout 37", continues to 11/1/31, late '30 frame no's commence

1930

 402

EAXXX-EA775

4

12.10

2 3/4

3 /14 

-none-

Indian 4, sequence continues to 11/1/31

1929

GEP/101

DGP4318-

2

6.61

 

 

-none-

45" 101 Scout

1929

GE/101

DG2638-

2

6.05

 

 

-none-

37" 101 Scout

1929

402

EA100-EAXXX

4

12.10

 

 

-none-

Indian 4, after 6/1/29 changes to EA series, which lasts till '31

1929

402

DA701-DAXXX

4

12.10

 

 

-none-

Indian 4. up to 6/1/29 then changes to EA100 and up

1929

HEP/301

CH2225-

2

8.45

3 1/4

4 7/16

-none-

'Chief' 74ci, CH numbers continue to 11/12/29

1928

GEP/101

DGP100-DGP4317

2

6.61

 

 

-none-

45" 101 Scout changeover yr from sf scout, mostly assumed '29

1928

GE/101

DG100-DG2637

2

6.05

 

 

-none-

37" 101 Scout changeover fm short frame (sf) scout assumed '29

1928

-none-

CZ100-

2

7.81

3 1/8

 

-none-

'Chief' 61ci, [last yr]

1928

LE/201

CL100-

1

3.03

 

 

-none-

'Prince'  21ci [last yr]

1928

-none-?

CH100-CH2224

2

8.45

3 1/4

4 7/16

-none-

'Big Chief' 74ci, to 3/15/28 then model change to HEP/301

1928

-none-

CGP1762-

2

6.61

 

 

-none-

101 Scout 45" change to 45" 101? note 7

1928

-none-

CGP100-CGP-1761

2

6.61

 

 

-none-

Scout 45" to 3/15/28 change to 45" 101? CGP444+ note 5

1928

-none-

CG2385-

2

6.05

 

 

-none-

101 Scout 37" to 3/15/28 then change to 37" 101.

1928

-none-

CG100-CG2384

2

6.05

 

 

-none-

Scout 37" to 3/15/28 then change to 37" 101. note 7

1928

402

DA100-DA700

4

12.10

 

 

-none-

Ace name dropped, model added, serial CA-DA change 6/1/29

1928

 Ace

CA100-CAXXX

4

12.10

 

 

-none-

Indian 'Ace' to 8/1/28, DA101-DA700 are also 1928. note 10

1927

Ace

VF100-

4

12.10

 

 

-none-

First Indian 'Ace' 4 cyl,78ci, and poss E1100  up note 11

1927

-none-

BZ100-

2

7.81

3 1/8

3 31/32

-none-

'Chief' 61ci (1000cc)

1927

-none-

BL100-

2

3.03

 

 

-none-

'Prince' 21ci

1927

-none-

BH100-

2

8.45

 

 

-none-

'Big Chief" 74ci

1927

-none-

BGP100-

2

6.61

 

 

-none-

Scout' 45ci (750cc)

1927

-none-

BG100-

2

6.05

 

 

-none-

'Scout' 37ci (600cc), last pedestal eng mounts before though-bolt

1926

-none-

AZ100-

2

7.81

 

 

-none-

'Chief' 61ci

1926

-none-

AL100-

1

3.03

 

 

-none-

'Prince' 21ci

1926

-none-

AH1180 only

2

??

 

 

-none-

'Big Chief' 80ci, prototype, 1 only?

1926

-none-

AH100-

2

9

 

 

-none-

'Big Chief' 74ci

1926

-none-

AG100-

2

5

 

 

-none-

'Scout' 37ci

1925

Model Y

90Y001-

2

9

 

 

-none-

'Big Chief' 74ci

1925

Model Y

80Y001-

2

8

 

 

-none-

'Chief' 61ci

1925

Model Y

50Y001-

2

5

 

 

-none-

'Scout' 37ci

1925

Model Y

30Y001-

1

2.75

 

 

-none-

'Prince' 21ci (350cc) single, [first model yr]

1924

Model X

90X001-

2

9

 

 

-none-

'Big Chief' 74ci

1924

Model X

80X001-

2

8

 

 

-none-

'Chief' 61ci

1924

Model X

70X001-

2

7

 

 

-none-

'Standard' ,last year for the former Powerplus

1924

Model X

50X001-

2

5

 

 

-none-

'Scout' 37ci

1923

Model V

90V001-

2

9

 

 

-none-

'Big Chief' 74ci (1200cc)

1923

Model V

80V001-

2

7

 

 

-none-

'Chief' 61ci

1923

Model V

70V001

2

7

 

 

-none-

'Standard' (pplus) 61ci note 12

1923

Model NP

VP001-

2

8

 

 

-none-

'Powerplus' 72ci renamed 'Standard' note 12

1923

Model V

50V001-

2

5

 

 

-none-

'Scout' 37ci

1922

Model T

80T001-

2

7

 

 

-none-

'Chief' 61ci (1000cc) first year, tho sold oct '21

1922

Model NP

TP001-

2

8

 

 

-none-

'Powerplus' 72ci big valve note 12

1922

Model T

70T001- 

2

7

 

 

-none-

'Powerplus' 61ci

1922

Model T

50T001-

2

5

 

 

-none-

'Scout' 37ci

1921

Model NP

SP001-

2

8

 

 

-none-

'Powerplus' 72ci big valve note 12

1921

Model S

70S001-

2

7

 

 

-none-

'Powerplus' 61ci

1921

Model S

50S001-

2

5

 

 

-none-

'Scout' 37ci

1920

Model NP

RP001-

2

8

 

 

-none-

'Powerplus' 72ci big valve note 12

1920

Model N

70R001-

2

7

 

 

-none-

'Powerplus' 61ci

1920

Model R

50R001-

2

5

 

 

-none-

'Scout'  37ci - [first model year]

1919

Model MP

MP001-

2

8

 

 

-none-

'Powerplus'  72ci, 8hp, big valve

1919

Model M

70M001-

2

7

 

 

-none-

'PowerPlus', 61ci, 7hp, 2nd series

1919

Model M

40M001-

1

4

 

 

-none-

'PowerPlus', 30.5ci single,loop frame,

1919

Model M

30M001-

2

2.5

 

 

-none-

2˝hp, loop frame, twin cyl, ci=?

1918

Model K

KRX001-

2

??

 

 

-none-

?hp, loop frame, 2nd series, special?

1918

Model N

70K001-

2

7

 

 

-none-

'Powerplus' 61ci

1918

Model B

50K001-

2

4

 

 

-none-

‘Little Twin’ 42ci, Hedstrom f-head motor note 17

1918

Model W

40K001-

1

4

 

 

-none-

'PowerPlus', 33.5ci single, commercial

1918

Model 0

30K001-

2

2.75

 

 

-none-

‘Light Twin’ 15.7ci, (Horizontally opposed motor)

1917

Model J

RX001-

2

7

 

 

-none-

7hp, loop frame,  special?

1917

Model N

70J001-

2

7

 

 

-none-

'Powerplus' 2nd model year for 61ci (1000cc)

1917

Model B

50J001-

2

4

 

 

-none-

‘Little Twin’ 42ci, Hedstrom f-head motor note 17

1917

Model W

40J001-

1

4

 

 

-none-

'PowerPlus', single,4hp, 33.5ci commercial model

1917

Model O

30J001-

2

2.75

 

 

-none-

Light Twin’ 15.7ci, (Horizontally opposed motor)

1916

Model G

70H001-

2

7

 

 

-none-

'Powerplus' first model year for L-head 61ci with cradle spring frame.

1916

Model F

70H001-

2

7

3 1/8

3 31/32

-none-

'Powerplus' first model year for L-head 61ci model with rigid frame.

1916

Model B

50H001-

2

5

 

 

-none-

‘Little Twin’ 42ci, Hedstrom f-head motor note 17

1916

Model K

20H001-

1

2.5

3 1/8

 3 3/32 

-none-

Feather weight" 2˝hp,  loop frame, two stroke

1915

Model G

70G001-

2

7

3 1/4 

3 43/64

-none-

7hp, loop frame, Big Twin, 1st series 6ci, {B}

1915

Model G

50G001-

2

4

2 3/4

 3 1/2 

-none-

Little Twin, 2nd series, 7hp, loop fr,  note 4, chrome vanadium frames! {B}

1915

Model E

40G001-

2

4

3 1/4

3 43/64

-none-

‘Little Twin’ 42ci, Hedstrom f-head motor note 17

1914

Model F

70F001-

2

7

3 1/4

3 43/64

-none-

7hp, loop frame, twin, 1st series, Hendee electric starter offered!

1914

Model F

40F001-

1

4

3 1/4

3 43/64

-none-

4hp, loop frame, single, electrics fitted!

1913

Model E

70E001-

2

7

3 1/4

3 43/64

-none-

7hp, loop frame, twin, yes & 80E0001 up as 32,000+ were built. note 8

1913

Model E

40E001-

1

4

3 1/4

3 43/64

-none-

4hp, loop frame, single, cradle spring rear frame, rigid still avail.

1912

Model D

70D001-

2

7

3 1/4

3 43/64

-none-

7hp, loop frame, twin, rigid rear only.

1912

Model D

40D001-

1

4

3 1/4

3 43/64

-none-

4hp, loop frame, single, first for kick starter!

1911

Model C

70C001-

2

7

3 1/4

3 43/64

-none-

7hp, loop frame, 2nd series, improved carb jets!

1911

Model C

40C001-

1

4

3 1/4

3 43/64

-none-

4hp, loop frame,  2nd series

1911

Model C

20C001-

2

5

3 1/4

3 43/64

-none-

5hp, loop frame, twin, 1st series

1911

Model C

1C001-

1

2.75

3 1/4

3 43/64

-none-

2ľhp, loop fr. sgle, 1st series, int and ext brakes, knock out rear axle!

1910

Model B

70B001-

2

7

3 1/4

3 43/64

-none-

7hp, loop frame, 2nd series

1910

Model B

40B001-

1

4

3 1/4

3 43/64

-none-

4hp, loop frame, 2nd series, footboards and front axles fitted!!

1910

Model B

20B001-

2

5

2 3/4

3 1/4

-none-

5hp, loop frame, twin

1910

Model B

1B01-

1

2.75

2 3/4

3 1/4

-none-

2ľhp, loop fr. sgle, 1st series, mech. oilers  multidisc clutch fitted!!

1909

-none-

IOA001-

1

3.5

 

 

-none-

3˝hp, loop frame, single, 1st series, 26.96ci (440cc)

1909

-none-

IA01-

1

2.75

 

 

-none-

2ľhp, loop frame, 19.30ci (315cc)

1909

-none-

70A001-

2

7

 

 

-none-

7hp, loop frame, 2nd series, Big Twin, 61ci (1000cc)

1909

-none-

40A001-

1

4

 

 

-none-

4hp, loop frame, 2nd series, 30.50ci (500cc), hand brake introduced!

1909

-none-

20A001-

2

5

 

 

-none-

5hp, loop frame, twin, 38.61ci (630cc), first 2spd transmission!

1908

-none-

T500-T1200

2

5

 

 

-none-

5hp, diamond frame

1907

-none-

T100-T499

2

3.5

 

 

-none-

3˝hp, diamond frame, first production v-twin!

1907

-none-

5000-

1

2.25

 

 

-none-

2Ľhp, diamond frame, first  yr of mechanically operated valves!

1906

-none-

2350-4048

1

2.5

 

 

-none-

2˝hp, diamond frame

1905

-none-

1168-2349

1

2.25

 

 

-none-

2Ľhp, diamond frame, also a light weight twin cyl

1904

-none-

621-1167

1

1.75

 

 

-none-

1ľhp, diamond frame, first yr of spring front and tandem attachment!

1903

-none-

244-620

1

1.75

 

 

-none-

1ľhp, diamond frame,  first yr of handlebar controls!

1902

-none-

101-243

1

1.75

 

 

-none-

1ľhp diamond frame,  first chain transmission!

1901

-none-

-none-

1

1.75

 

 

-none-

1ľhp diamond frame 90lbs!!, Indian Carb!

 

 

 

Engine Number Series and Year decoding.  

J

A

B

C

D

E

F

G

H

I

0

1

2

3

4

5

6

7

8

9

 

Frame

Arrow

1xx

Scout/Warrior/TT

2xx

Chief

3xx

1950 -1953  
Midstream the 1950 Chief serial numbers changed from CEJ to just C on BOTH engines and frames, upsetting the rules as shown in the 1932-1950 table below . Early 50's Chiefs were CEJ, late '50 and' 51 Chiefs were  just 'C', and all '52 and '53 Chiefs were 'CS' . When this change happened all vertical twins also had frame numbers matching the engine exactly too. Examples :
Eng# BEJ911, Frame # 250911 is 1950 Warrior.
Eng# B1003, Frame # B1003 is 1951 Warrior
 

 

A

B

C

D

E

F

G

H

I

0

1

2

3

4

5

6

7

8

9

 

Frame

Jr. Scout

5xx

Std Scout, & VT

2xx

Sport Scout, MP

6xx

101 Scout

101

741 (mil)

741

841 (mil)

841

Chief

3xx

Indian 4

4xx

MP=Motoplane (in Jr.Scout frame)
VT=Vertical Twins excl Arrow.

1932 -1950  Frame Numbers introduced late 1930 early 1931  (see note 9)
Example: we have an unknown motor (or cycle) that's stamped CDF 6403 and a spare frame stamped 441 1089  <work in reverse, i.e. numerals to letters using table or your fingers!>

1st letter is C, this is the series,
all Chiefs are 3, Fours are 4 etc (see table left)
2nd letter D is the decade year  4 and the
3rd letter F is the digit year 6

Answers:
Motor is 1946 Chief, Serial# 6403 (6303rd* made!)
Frame is 1941 Four, Serial# 1089, (989th* made!)   *as first machine started at xxx101
 
In order for a cycle to have 'matching numbers', the frame number must match the engine number and the first three numeric digits of the frame number equal the decoded motor number. i.e. for our example, the frame would have to read 346 6403.  see Frame Numbers section 

 

 

A

B

C

D

E

F

Yr

'26

'27

'28

'29

'30

'31

 

Engine

Prince 21ci

L

Scout 37ci

G

Scout 45ci

GP

Chief 61ci

Z

Big Chief 74ci

H

Four 1926/7

E

Four 1928-1931

A

1926 -1931   
Indian lost the plot for a few years between 1925 and 1933 with their numbering, possibly exacerbated by the 101 series 'no new model years', the Ace acquisition and how to incorporate frame numbers in 1930/31 which I will ignore in this scenario.

Examples:
AH1088 is a 1926 Big Chief, 74ci, serial 1088 
(similarly, AZ1088 would be 1926 61ci)
BGP1055 is a 1927 Scout, 45ci, serial 1055
(similarly, BG1055 would be 1927 Scout 37ci)
EA779 is a 1930 Four,  serial 779
(similarly, BL779 would be 1926 Prince)

 

Model/hp (Hendee/Indian)
1=
2˝hp single
2
= 5hp twin or 2˝hp single
3 = 4hp twin or 2˝hp twin,
 or  21ci Prince single
4 = 4hp single or 30.5ci Pplus
5 = 7hp twin or Scout 37"
7 = 7hp twin or 61ci PowerPlus
8 = 8hp twin or  Chief 61ci
9 = Chief 74ci or 72ci Powerplus

Years     Example

A=1909
B=1910
C=1911
D=1912
E=1913   Ex.3
F=1914
G=1915
H=1916
J=1917
K=1918
M=1919  Ex.2
R=1920
S=1921
T=1922
V=1923
X=1924  Ex.1
Y=1925
 
(I, L, N-Q, U & W  not used.)
also see note 12 for ?Pxxx models (where ?=R,S,T or V)

 1909 -1925  hang on it gets a little tougher now!.  
Its a little like an odometer that clocks over in units, tens, hundreds and thousands and tens of thousands. You may find it easier to pay attention to the year first, then look at table and determine the models for that year, see Example 2.

Example 1 - 51X107
Take the engine number 51X107 which breaks down to:
5 is Scout 37", (because of X) then because the second number is not zero (as it would be if serial < 1000)  we add it (1000) to the serial 107 making it 1,107,
The X is the year 1924. So it is a 1924 Scout with a engine serial of 1107...
e.g.  a serial of 54X155 would be the same model and yr with a serial of  4,155.
similarly, a serial of 67X157 would be the same model and yr with a serial of 17,157.

Example 2 - 72M911  
Take the engine number 72M911 which breaks down to:
'72 equals 7 &2 and  think of this as 2000 (thousandths digit)
The M is the year 1919. The 7 is a 61ci Powerplus (because of  the M) and the remaining 2000 is the thousandths unit of the engine number whereby adding it to 911 gives us 2,911.
So it is a 1919 Indian Powerplus with a engine serial of 2911...

similarly, a serial of 81M177 would be the same model and yr with a serial of 11177.

Example 3 - 86E630   <please see note 8>
Take the engine number  86E630 which breaks down to:
 86 equals 7 &10+6,  think of this as 10000 (ten thousandths digit, i.e. 70xxx-80xxx), then add this PLUS the 6000 (thousandths) to the 630 it gives us16,630.
The E is the year 1913. The 7 is a 7hp Hendee twin.  So it is a 1913 7hp Twin with a engine serial of 16630...
 
similarly, a serial of 70E433 would be the same model and yr with a serial of 433.


 

1902 101-243
1903 244-620
1904 621-1167
1905 1168-2349
1906 2350-4048

1902 -1908  
There was no commercial sales in 1901 but numbering began 1902 starting at #101 and remaining in sequence to #4048 until 1906. This gives us an insight into production numbers. From this point till 1909 as the database illustrates, it’s anyone's guess what someone was dreaming up! 

Engine number suffixes
"A letter may be stamped after the engine number (but off to right of boss itself, i.e. on crankcase): these letters are:-
A is for aluminum pistons which were optional over std cast iron pistons in scout 45"in 1928 see note 5
B is for Battery ignition (distributor).  (post 1933, see below note) ...BUT
   B
was also used (briefly) to denote blackout lighting fitted by the factory on mil. cycles during WWII. see note 6
   B
also designated aluminum piston and/or special clearances for performance and/or sustained speeds on pre '28".
   B
also designated aluminum piston, chief carb (DLX81?), chief valve springs and chief inlet nipples/manifold used on
special factory  101 Scouts.
BM
is for Bonneville Motor.
BY is for Battery (Distributor) ignition on 'Y' motors, i.e.. Y manifolds, trench heads (Ricardo) etc - mostly mid 30's models.
M
is for Magneto ignition.
MY
is for Magneto ignition on 'Y' motors, - rare, mostly mid thirties models.


Frame number locations
(also see note 9)
'31 and up rigid frames are on a boss just below the left rear axle slot,
'40 spring frames are on the left rear shock casting above the axle slot,
'41 through '51 are on the lower left  shock mounting ring,
'52 through '53 are on the front face of the right front footboard casting mount.
'49-'52 VT's (=Vertical Twins), i.e. Scouts, Warriors/ TT's and Arrows, have the frame serial on the front forks.
'34-'42 DT's (=Dispatch Tows), i.e. 3 wheel Sports Scouts have the frame # under the seat on the frame casting.

Matching Numbers
"The practice of re-stamping frames to match engines to make a 'matching number machine ' and vice versa often results in the frame number being exactly the same as the engine number, e.g. CDF 4321 and CDF 4321. In actual fact the frame would have been stamped, in this case, 346 4321. This is often the single most giveaway as Indian did not match serials on chiefs till mid 1950, watch out for this on eBay!"
 

Production Numbers  
Much of this data has been gleamed from Jerry Hatfield - but we still need more info please.
key to notes
sc=sidecars,  nr=no records?,  co=chiefs only, ap=approximate

Year

Qty

Note

Year

Qty

Note

Year

Qty

Note

1901

3

1919

21,500

1937

6,037

1902

143

1920

?

nr

1938

3,650

1903

376

1921

?

nr

1939

3,012

1904

596

1922

?

nr

1940

10,431

1905

1,181

1923

?

nr

1941

8,739

1906

1,698

1924

?

nr

1942

16,647

1907

2,176

1925

?

nr

1943

16,456

1908

3,257

1926

?

nr

1944

17,006

1909

4,771

1927

?

nr

1945

2,070

1910

6,137

1928

?

nr

1946

3,621

1911

9,763

1929

?

nr

1947

11,849

1912

19,500

1930

?

nr

1948-49

9,000

ap

1913

32,000

1931

4,557

1949

?

nr

1914

25,000

1932

2,360

1950

2000+

co,ap

1915

21,000

sc=3,200

1933

1,667

1951

500+

co,ap

1916

22,000

sc=3,700

1934

2,809

1952

500+

co,ap

1917

20,500

1935

3,703

1953

2000+

co,ap

1918

22,000

sc=13,300

1936

5,028

 

 

 

 

Extended Notes and Contributions.
1. Introduction. This database is by no means perfect, but as close as we can collectively get it to-date. Consternation lies mainly between the dates of March 15th, 1928 and 1st November 1st, 1931, the latter being when frame numbers were introduced and numbering and model numbers were somewhat rationalized.

2.
Several of the serials & dates have been assumed or generalized based on rationalizing conflicting info from each source all of which have differed. Remember model years differ from production years, many new models were offered in the last qtr of the prev year
All dates are of the MM/DD/YY format.

3.
Four valve specials and factory racer motors were not identified and/or recorded.

4. The 1915 parts book also uses letter designation of models;
B is a twin (50 series) with smaller or lighter engine with few parts
interchangeable with other twins models C & D,
E model is the single cyl 40G series

5. Cast iron pistons std on Scout 45 unless motor bears the letter 'A', which uses aluminum pistons, this is from:
 CGP444 on, i.e. CGP445 A.  see eng# suffixes  

6. All Export 741's GDA101 & up were supplied with blackout lighting as standard.
1940 640B's #'s FD01015-FDO1515 and FD02310-FD02636 were also factory fitted with optional kits offered for others.

7. The highest 'CG' number recorded for '28 short frame (std) scouts by the 101 Association is:
CG2384, the highest 45" 'CGP" number is CGP1761, deducting 100 from each should give known numbers produced before the changeover to 101.

8. All 09 thru 12 were rigid frames and all 13 were leaf spring front and swing arm rear.  In 1914 and subsequent there were also rigid frame models.
70E1005 would be the same Model 7 (61 CID Twin)  with a SN of 1005.
80E0450 would be the same engine/model with a SN of 10450 (7+1, i.e. 1 in front of serial number).


9. A 1930 101 (EG901) has been found with a frame number of SI322. Originally SI344 was recorded as the starting frame number as first used in '31. This proves frame numbers started late '30 not '31. (EG901 is just 24 units serials off a '31 101). We would like to know about any lower frame numbers than SI322 please, until then we will use SI322 a starting reference. 

10. The 28 Ace had been listed with serials starting as CA210 up, a reader has said "I was lucky enough last year to find a 100% complete 1928 Indian ACE in Sweden with all the delivery dockets and service history for the first few years, its serial number is CA196"

11. While not Indian (yet!) 1920-1926 Ace Motorcycle serial numbers are included here to give some insight into the numbering before Indian acquired Ace from Michigan Motors Jan '27.
1920 A1000-
1921 A1xxx-?
1922 B3000-
1923 B3xxx-?
1924 D8000-,
1925 no production? or no info? -
1926 E1000-, (poss just E1100 up?)

12. Starting 1920 the 61ci PowerPlus (N and NE) was offered in a larger 72ci capacity named the NP and NEP (electrics) models. These 11
78cc models had engine numbers starting with the following:
1920 ="RPxxx", 
1921="SPxxx",
1922="TPxxx" 
1923 ="VPxxx".
These were invariably big valve models, but there was 61" big valve models also that had an enlarged (chief size) exhaust valve. In 1923 Indian renamed the PowerPlus to Standard in order to dispel the myth that the PowerPlus had more power than the Chief.

13.The rear frame # began with 648 followed by a 3 digit #. Such as, 648 106. I used to own the bike Floyd Emde rode at Daytona in '48. I restored it in '78-79 and later sold it to a mid-west collector-dealer. The rear frame on these machines was standard 741 with the addition of a ferrule on either side for the seat spring bolt. To the best of my recollection they started at FDH 101 and went to FDH 150. The rear frames were stamped 648 101 to 648 150.

14. The Sport Scout based three wheel dispatch tows (DT), (previously known as the service car in 1931 in the form of a 101 scout.  later known as traffic car in some configurations). These 1934 to 1942  where offered in many styles and had the standard sports scout engine serial nomenclature, with the following exception:  the frame number is under the seat on the casting where the tubes meet.
This configuration was revived again for the police depts in 1950-1952 in the Indian Patrol which consisted of either 45ci Scout, 80" Chief or 30.5 ci Warrior models..
I had a 1951 (FEA106), a friend has FEA103 & FEA104. A FEA105 is overseas and is a two wheeler, I have pics.  You can’t say it was never made because if you wanted special orders they would make it. 103 &  were NYCFD (fire dept) bikes. I sold mine 20 years ago, my friend still has his.”

15. I have a listing of factory serial number listings from 1910 to 1931. while the form doesn't have the factory's name on it persay,  the weight and age of the paper, the typeface and layout, plus the mention of Form M801 (Form M779 is a riders manual, M809 is a parts list and so on) leads me to believe it is authentic.

16. "Starting with Motor no. EA580, machines were equipped with all steel clutch, wide transmission gears, single keyway trans shaft
and engine sprocket. prefix letters AB are used to designate this change".


17.
The Model B ‘Little Twin’ (with 42ci Hedstrom motor), continued to be sold in the UK, Australia, NZ? etc for a number of years after the 1915 cut-off that occurred in the USA.  The 1916 UK sales catalogue states:  “This model has proved so wonderfully popular during the past year, that we are continuing it on the market.”  The same model is still listed in the 1918 UK sales catalogue.
..."Earlier this year I purchased a 1917 Indian Model B 'Little Twin' (this is the one with the 680cc (42ci) Hedstrom motor). According to all the books that I have read there is supposed to be no such thing, as the Hedstrom's were phased out at the end of 1915. However, I have found documentation that these bikes continued to be sold in Australia and the UK right up until 1918. I currently know of 3 such machines (1916 and 1917) and a number of engines still in existence".
The same model is still listed in the 1918 UK sales catalogue.
..."Earlier this year I purchased a 1917 Indian Model B 'Little Twin' (this is the one with the 680cc (42ci) Hedstrom motor). According to all the books that I have read there is supposed to be no such thing, as the Hedstrom's were phased out at the end of 1915. However, I have found documentation that these bikes continued to be sold in Australia and the UK right up until 1918. I currently know of 3 such machines (1916 and 1917) and a number of engines still in existence".