1901-1953 Indian Motorcycle – Parts – Accessories – Service

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Have you wondered how to identify an Indian Motorcycle? What does this engine number mean? Where is the frame number?
Hopefully the following table will help clarify the mess Indian left us with.
One numbering system was not enough for Indian. It seems like every decade they decided they had to change how they numbered their motorcycles.
This has caused much confusion of what all these numbers mean.
The following information was originally compiled by Greg Cooney from New Zealand

Hopefully we can keep the information flowing to help more people with their Indian Motorcycles

Indian Serial Numbers 1901-1953

 

****** Bore and Stroke (BS) Data current; under development, use as guide only for the time being ******
YearModelEng.NumberCyls.H.PBoreStrokeFrame NumberNotes
1953353CS61001-CS62500+2 ? 3.250 4 13/16CS61001-CS62500+last batch of 53’s where a large sequence of serials were skipped
1953353CS6501-CS69992 3.250 4 13/16CS6501-CS6999‘Chief’ 53, serials above 6500 accepted as 53 if registration supports.
1952352CS6001-CS65002CS6001-CS6500‘Chief’ 52, up to 6500 whether ’52 or ’53 may depend on registration?
1952?BB1001T-2B1001T-‘Warrior TT’, last model year
1952?CS4001-2CS4001-‘Warrior’, last model year, Warrior Patrols (3 wheeler for Police/FD)
1951351C4001-C45002C4001-C4500‘Chief’ 80ci, the last of the eighty’s without yr confusion!
1951651?FEA101-?2FEA101-?”Dispatch Tow’ Scout, NYC Fire Dept Only?, note 14
1951?B1001T-2B1001T-‘Warrior TT’, frame sequence continues thru ’52
1951?B101-2B101-‘Warrior’
1950350C2001-C25002C2001-C2500‘Chief’ 80ci, 2nd series, #’s changed, C2441-C2500 to PDNYC Police
1950350CEJ1001-CEJ150023501001-3501500‘Chief’ 80ci (1320cc), first year for telescopic forks, 1st series
1950?BEJ1001-22501001T-‘Warrior TT’, 30.50ci (500cc)
1950?BEJ101-2250101-‘Warrior’, 30.50ci (500cc)
1950250BBEJ1001-222501001-Scout’, last model year
1950150AAEJ1001-111501001-Arrow’, last model year
1949349CDI1001-23491001-Chief, very limited production, serials inflated
1949249BDI101-2249101-Scout’, 26ci, (440cc), first vertical twin
1949149ADI101-1149101-Arrow’, 13ci, (220cc), first vertical single
1948348CDH101-2348101-Chief’, new frame, new oil pump etc
1948648FDH101-1502648101-15045″ Daytona ‘big base’ Scout. note 13
1947347CDG101-2347101-‘Chief’, no other models
1946346CDF101-2346101-‘Chief’, new girder forks, no other models
1945345CDE101-2345101-‘Chief’ limited production,
1944344CDD101-2344101-‘Chief’, no other models, all military?
1943343CDC101-2343101-‘Chief’, very limited civilian production, last of 741’s, high serials
1942442DDB101-4442101-Indian 4, the last year of the 4ours..
1942342CDB101-2342101-‘Chief’, 74ci
1942642FDB101-2642101-45″ ‘Sport Scout’, last year of the SS/SSDT, Daytona in ’48
1942542EDB101-2542101-30.50ci ‘Junior Scout’
1941441DDA101-4441101-Indian 4, 78ci
1941341CDA101-2341101-‘Chief’, 74ci
1941841HDA101-2841101-Military, 841, 45ci transverse, shaft drive
1941641FDA101-2641101-45″ ‘Sport Scout’ and DT’s
1941741GDA101-2741101-Military 741(b) lightweight 30.50ci note 6
1941541EDA101-2541101-30.50ci ‘Junior Scout’
1940440DDO101-4440101-Indian 4, 78ci
1940340CAV101-2CAV101-CAV=Continental Army Vehicle (aka Military Chief, Canadian)
1940340CDO101-2340101-‘Chief’, incl Military, except Canada
1940640FDO101-2640101-45″ ‘Sport Scout’ and Military 640 Scouts note 6
1940540EDO101-2540101-30.50ci ‘Scout Pony’ renamed ‘Thirty-Fifty’
1939439DCI101-4439101-Indian 4
1939339CCI101-2339101-‘Chief’ 74ci
1939639FCI101-2639101-45″ ‘Sport Scout’ and Dispatch Tows (DT)
1939539ECI101-2539101-30.50ci ‘Junior Scout’
1938438DCH101-4438101-Indian 4, 78ci
1938338CCH101-2338101-‘Chief’ 74ci
1938638FCH101-2638101-45″ ‘Sport Scout’ and Dispatch Tows
1938538ECH101-2538101-30.50ci ‘Junior Scout’
1937437DCG101-4437101-Indian 4, 78ci
1937337CCG101-2337101-‘Chief’ 74ci
1937637FCG101-2637101-45″ ‘Sport Scout’ and Dispatch Tows
1937237BCG101-2237101-45″ Std ‘Scout’ last model year
1937537ECG101-2537101-30.50ci ‘Junior Scout’ renamed ‘Scout Pony’
1936436DCF101-4436101-Indian 4, 78ci
1936336CCF101-2336101-‘Chief’ ,74ci
1936636FCF101-2636101-45″ ‘Sport Scout’ and Dispatch Tows
1936236BCF101-2236101-45″ Std ‘Scout’
1936536ECF101-2536101-30.50ci ‘Junior Scout’
1935435DCE101-4435101-Indian 4, 78ci
1935335CCE101-2335101-‘Chief’ 74ci
1935635FCE101-2635101-45″ ‘Sport Scout’ and Dispatch Tows note 14
1935235BCE101-2235101-45″ Std ‘Scout’
1935535ECE101-2535101-30.50ci ‘Junior Scout’
1934434DCD101-4434101-Indian 4, 78ci
1934334CCD101-2334101-‘Chief’ ,74ci
1934634FCD101-2634101-45″ ‘Sport Scout’, 1st yr with new keystone frame
1934234BCD101-2234101-45″ Std ‘Scout’ (still chief frame]
1934534ECD101-25.0534101-30.50ci ‘Junior Scout’
1933433DCC101-4433101-Indian 4, 78ci (1278cc)
1933333CCC101-2333101-‘Chief’ 74ci
1933633FCC101-2633101-1yr only 45ci ‘Motoplane’ (in Jr Scout frame)
1933233BCC101-2233101-45″ Std ‘Scout’
1933533ECC101-25.0533101-30.50ci ‘Junior Scout’
1932403DOC101-4403101-Indian 4, 78ci
1932EOC/503EOC101-25.02 1/23 1/16503101-‘Junior’ or ‘Pony’ Scouts begin, 30.5ci (500cc) 101 mo end
1932COC/303COC101-28.53 1/44 7/16303101-Chief ,74″
1932BOC/203BOC101-26.612 7/83 1/2203101-Std ‘Scout’ 45″ in Chief frame,
1931HEP/302EH1536-28.453 1/44 7/16H1410-Chief, 74″
1931GP/101EGP3081-26.612 7/83 1/2G4050101 Scout 45″, also first service car. [last year]
1931G/101EG925-26.052 3/43 3/16SI346-101 Scout 37″, frame numbers continue note 9
1931402EA776-EA1509412.102 3/43 1/4-none-Indian 4, sequence continues to 11/1/31
1930HEP/302EH100-EH153528.453 1/44 7/16-none-Chief 74″, sequence continues to 11/1/31
1930GP/101EGP100-EGP308026.61-none-101 Scout 45″ ,sequence continues 11/1/31
1930G/101EG100-EG92426.05none-SI322 note 9101 Scout 37″, continues to 11/1/31, late ’30 frame no’s commence
1930402EAXXX-EA775412.102 3/43 /14-none-Indian 4, sequence continues to 11/1/31
1929GEP/101DGP4318-26.61-none-45″ 101 Scout
1929GE/101DG2638-26.05-none-37″ 101 Scout
1929402EA100-EAXXX412.10-none-Indian 4, after 6/1/29 changes to EA series, which lasts till ’31
1929402DA701-DAXXX412.10-none-Indian 4. up to 6/1/29 then changes to EA100 and up
1929HEP/301CH2225-28.453 1/44 7/16-none-‘Chief’ 74ci, CH numbers continue to 11/12/29
1928GEP/101DGP100-DGP431726.61-none-45″ 101 Scout changeover yr from sf scout, mostly assumed ’29
1928GE/101DG100-DG263726.05-none-37″ 101 Scout changeover fm short frame (sf) scout assumed ’29
1928-none-CZ100-27.813 1/8-none-‘Chief’ 61ci, [last yr]
1928LE/201CL100-13.03-none-‘Prince’ 21ci [last yr]
1928-none-?CH100-CH222428.453 1/44 7/16-none-‘Big Chief’ 74ci, to 3/15/28 then model change to HEP/301
1928-none-CGP1762-26.61-none-101 Scout 45″ change to 45″ 101? note 7
1928-none-CGP100-CGP-176126.61-none-Scout 45″ to 3/15/28 change to 45″ 101? CGP444+ note 5
1928-none-CG2385-26.05-none-101 Scout 37″ to 3/15/28 then change to 37″ 101.
1928-none-CG100-CG238426.05-none-Scout 37″ to 3/15/28 then change to 37″ 101. note 7
1928402DA100-DA700412.10-none-Ace name dropped, model added, serial CA-DA change 6/1/29
1928

Ace

CA100-CAXXX412.10-none-Indian ‘Ace’ to 8/1/28, DA101-DA700 are also 1928. note 10
1927AceVF100-412.10-none-First Indian ‘Ace’ 4 cyl,78ci, and poss E1100 up note 11
1927-none-BZ100-27.813 1/83 31/32-none-‘Chief’ 61ci (1000cc)
1927-none-BL100-23.03-none-‘Prince’ 21ci
1927-none-BH100-28.45-none-‘Big Chief” 74ci
1927-none-BGP100-26.61-none-Scout’ 45ci (750cc)
1927-none-BG100-26.05-none-‘Scout’ 37ci (600cc), last pedestal eng mounts before though-bolt
1926-none-AZ100-27.81-none-‘Chief’ 61ci
1926-none-AL100-13.03-none-‘Prince’ 21ci
1926-none-AH1180 only2??-none-‘Big Chief’ 80ci, prototype, 1 only?
1926-none-AH100-29-none-‘Big Chief’ 74ci
1926-none-AG100-25-none-‘Scout’ 37ci
1925Model Y90Y001-29-none-‘Big Chief’ 74ci
1925Model Y80Y001-28-none-‘Chief’ 61ci
1925Model Y50Y001-25-none-‘Scout’ 37ci
1925Model Y30Y001-12.75-none-‘Prince’ 21ci (350cc) single, [first model yr]
1924Model X90X001-29-none-‘Big Chief’ 74ci
1924Model X80X001-28-none-‘Chief’ 61ci
1924Model X70X001-27-none-‘Standard’ ,last year for the former Powerplus
1924Model X50X001-25-none-‘Scout’ 37ci
1923Model V90V001-29-none-‘Big Chief’ 74ci (1200cc)
1923Model V80V001-27-none-‘Chief’ 61ci
1923Model V70V00127-none-Standard’ (pplus) 61ci note 12
1923Model NPVP001-28-none-‘Powerplus’ 72ci renamed ‘Standard’ note 12
1923Model V50V001-25-none-‘Scout’ 37ci
1922Model T80T001-27-none-‘Chief’ 61ci (1000cc) first year, tho sold oct ’21
1922Model NPTP001-28-none-‘Powerplus’ 72ci big valve note 12
1922Model T70T001-27-none-‘Powerplus’ 61ci
1922Model T50T001-25-none-‘Scout’ 37ci
1921Model NPSP001-28-none-‘Powerplus’ 72ci big valve note 12
1921Model S70S001-27-none-‘Powerplus’ 61ci
1921Model S50S001-25-none-‘Scout’ 37ci
1920Model NPRP001-28-none-‘Powerplus’ 72ci big valve note 12
1920Model N70R001-27-none-‘Powerplus’ 61ci
1920Model R50R001-25-none-‘Scout’ 37ci [first model year]
1919Model MPMP001-28-none-‘Powerplus’ 72ci, 8hp, big valve
1919Model M70M001-27-none-‘PowerPlus’, 61ci, 7hp, 2nd series
1919Model M40M001-14-none-‘PowerPlus’, 30.5ci single,loop frame,
1919Model M30M001-22.5-none-2½hp, loop frame, twin cyl, ci=?
1918Model KKRX001-2??-none-?hp, loop frame, 2nd series, special?
1918Model N70K001-27-none-‘Powerplus’ 61ci
1918Model B50K001-24-none-‘Little Twin’ 42ci, Hedstrom f-head motor note 17
1918Model W40K001-14-none-‘PowerPlus’, 33.5ci single, commercial
1918Model 030K001-22.75-none-‘Light Twin’ 15.7ci, (Horizontally opposed motor)
1917Model JRX001-27-none-7hp, loop frame, special?
1917Model N70J001-27-none-‘Powerplus’ 2nd model year for 61ci (1000cc)
1917Model B50J001-24-none-‘Little Twin’ 42ci, Hedstrom f-head motor note 17
1917Model W40J001-14-none-‘PowerPlus’, single,4hp, 33.5ci commercial model
1917Model O30J001-22.75-none-Light Twin’ 15.7ci, (Horizontally opposed motor)
1916Model G70H001-27-none-‘Powerplus’ first model year for L-head 61ci with cradle spring frame.
1916Model F70H001-273 1/83 31/32-none-‘Powerplus’ first model year for L-head 61ci model with rigid frame.
1916Model B50H001-25-none-‘Little Twin’ 42ci, Hedstrom f-head motor note 17
1916Model K20H001-12.53 1/8 3 3/32-none-Featherweight” 2½hp, loop frame, two stroke
1915Model G70G001-273 1/43 43/64-none-7hp, loop frame, Big Twin, 1st series 6ci, {B}
1915Model G50G001-242 3/4 3 1/2-none-Little Twin, 2nd series, 7hp, loop fr, note 4, chrome vanadium frames! {B}
1915Model E40G001-243 1/43 43/64-none-‘Little Twin’ 42ci, Hedstrom f-head motor note 17
1914Model F70F001-273 1/43 43/64-none-7hp, loop frame, twin, 1st series, Hendee electric starter offered!
1914Model F40F001-143 1/43 43/64-none-4hp, loop frame, single, electrics fitted!
1913Model E70E001-273 1/43 43/64-none-7hp, loop frame, twin, yes & 80E0001 up as 32,000+ were built. note 8
1913Model E40E001-143 1/43 43/64-none-4hp, loop frame, single, cradle spring rear frame, rigid still avail.
1912Model D70D001-273 1/43 43/64-none-7hp, loop frame, twin, rigid rear only.
1912Model D40D001-143 1/43 43/64-none-4hp, loop frame, single, first for kick starter!
1911Model C70C001-273 1/43 43/64-none-7hp, loop frame, 2nd series, improved carb jets!
1911Model C40C001-143 1/43 43/64-none-4hp, loop frame, 2nd series
1911Model C20C001-253 1/43 43/64-none-5hp, loop frame, twin, 1st series
1911Model C1C001-12.753 1/43 43/64-none-2¾hp, loop fr. sgle, 1st series, int and ext brakes, knock out rear axle!
1910Model B70B001-273 1/43 43/64-none-7hp, loop frame, 2nd series
1910Model B40B001-143 1/43 43/64-none-4hp, loop frame, 2nd series, footboards and front axles fitted!!
1910Model B20B001-252 3/43 1/4-none-5hp, loop frame, twin
1910Model B1B01-12.752 3/43 1/4-none-2¾hp, loop fr. sgle, 1st series, mech. oilers multidisc clutch fitted!!
1909-none-IOA001-13.5-none-3½hp, loop frame, single, 1st series, 26.96ci (440cc)
1909-none-IA01-12.75-none-2¾hp, loop frame, 19.30ci (315cc)
1909-none-70A001-27-none-7hp, loop frame, 2nd series, Big Twin, 61ci (1000cc)
1909-none-40A001-14-none-4hp, loop frame, 2nd series, 30.50ci (500cc), hand brake introduced!
1909-none-20A001-25-none-5hp, loop frame, twin, 38.61ci (630cc), first 2spd transmission!
1908-none-T500-T120025-none-5hp, diamond frame
1907-none-T100-T49923.5-none-3½hp, diamond frame, first production v-twin!
1907-none-5000-12.25-none-2¼hp, diamond frame, first yr of mechanically operated valves!
1906-none-2350-404812.5-none-2½hp, diamond frame
1905-none-1168-234912.25-none-2¼hp, diamond frame, also a light weight twin cyl
1904-none-621-116711.75-none-1¾hp, diamond frame, first yr of spring front and tandem attachment!
1903-none-244-62011.75-none-1¾hp, diamond frame, first yr of handlebar controls!
1902-none-101-24311.75-none-1¾hp diamond frame, first chain transmission!
1901-none--none-11.75-none-1¾hp diamond frame 90lbs!!, Indian Carb!

Engine Number Series and Year decoding.

JABCDEFGHI
0123456789

Frame

Arrow1xx
Scout/Warrior/TT2xx
Chief3xx
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.
ABCDEFGHI
0123456789

Frame

Jr. Scout5xx
Std Scout, & VT2xx
Sport Scout, MP6xx
101 Scout101
741 (mil)741
841 (mil)841
Chief3xx
Indian 44xx

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 6Answers:
Motor is 1946 Chief, Serial# 6403 (6303rd* made!)
Frame is 1941 Four, Serial# 1089, (989th* made!) *as first machine started at xxx101In 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 Top
ABCDEF
Yr’26’27’28’29’30’31

Engine

Prince 21ciL
Scout 37ciG
Scout 45ciGP
Chief 61ciZ
Big Chief 74ciH
Four 1926/7E
Four 1928-1931A
1926 -1931 Top
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) Top
Model/hp (Hendee/Indian)
1=
2½hp single
2
= 5hp twin or 2½hp single
3 = 4hp twin or 2½hp 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!. Top
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 151X107
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…
eg. 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. Top
1902 101-243
1903 244-620
1904 621-1167
1905 1168-2349
1906 2350-4048
1902 -1908 Top
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, its anyone’s guess what someone was dreaming up! Top
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 ear 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. thanks to John Welch
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 ‘ an vice versa often results in the frame number being exactly the same as the engine number, eg 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!”
Extended Notes and Contributions. Top
1. Introduction. This database is by no means perfect, but as close as we can collectively get it to-date, if you have something to contribute, or query my info please do so as this is a collaborative effort. 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 .(thanks to Chuck Garrett)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 Top6. 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 change over 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).
(thanks <i think!> to Chuck Garrett)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. Top10. 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″ (thanks to Ted Worrall)

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 1178cc 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. (thanks to David Bedding) Top

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. (thanks toRoger Hensley)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.. various VI members
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. Greg16. “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”. from Form M801 . Greg

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“.
thanks to
David Bedding (Beddo) from Australia for his research and input into the early twins especially the lesser known little twin.

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