This is a compilation of some of the most common data needed for Indian
motorcycles. If you have information that you think would be helpful to others,
feel free to send it to me and I'll add it in. Further down the page you'll
find other common items and resources that I have gathered in hopes of building
a central data resource for everyone to use. I hope you find it useful.
Email info, corrections or questions HERE.

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TAP AND DIE SIZES FOR YOUR INDIAN THREADED PARTS

MOTOR PARTS
Model
Special
Size
Timing Inspection Plug  All Yes 3/4"-24
Tappet Adjusting Bolt & Nut  All Yes 9/32"-32
Lower Timing/Sump Plugs  All No  1/8" NPT-27
Motor Sprocket Nut  Chief Yes 5/8"-24
Crank Shaft (Rod) Nuts  Chief Yes 3/4"-24
Flywheel Shaft Nuts (Pinion/Drive @ Flywheel)  Chief  Yes 5/8"-24
Pinion Gear Nut (LEFT HAND THREAD Chief Yes 3/8"-24L
Cylinder Studs  All  No  3/8"-24
Oil Pump Gear (On Cam)  All  No  7/16"-20
Oil Pump/Sump Elbow Jamb Nuts  All Yes 7/16"-24
       
PRIMARY DRIVE      
Chain Inspection/Filler Plugs  All  Yes  3/4"-24
Bottom Drain Plug  All  No  1/8" NPT-27
Clutch Arm Nut (On Worm)  All  Yes  1/2"-24
Lower Rear Primary Bolt (Into Transmission)  Chief  No  1/4"-20
Clutch Pressure Plate Nuts  All  No  5/16"-24
Clutch Driver Hub (LEFT HAND THREAD All  Yes  5/8"-24L
       
LINKERT/SCHEBLER CARBURETOR PARTS      
Float Bowl to Body Nut  All Linkert Yes 3/4"-20
Needle Seat to Bowl  All Linkert No 7/16"-20
Needle Seat to Bowl Schebler Yes 13/32"-24
Needle Seat to Bowl (Shouldered Bowl Models Only) Schebler Yes 3/8"-24
Fuel Line to Needle/Seat All Linkert Yes 7/16"-27
Fuel Line to Petcock All L/S Yes 7/16"-24
Butterfly Retaining Screws All No #6-32
Idle/Hi Speed Adjusting Needles  All Linkert Yes 1/4"-40
Idle Passage Plug & Fixed Jets All No #8-32
Manifold Screws (Counter Sunk Oval Head)  All Linkert  No 5/16"-18
Air Cleaner Screws (Fillister)  All Linkert No #12-24
Air Cleaner Screws (Air Horn) Schebler No #10-24
Bowl Top Plug (Over Needle & Seat)  All Linkert  Yes  
Bowl Top Plug (Over Needle & Seat) Schebler Yes 9/16"-24
Float Pivot & Drain Plug  All Linkert  No 1/4"-32 
Idle Body Plug All Linkert Yes 5/16"-32
Idle Body Plug Schebler Yes 5/16"-24
       
TRANSMISSION PARTS      
Bottom Drain Plug  All No 1/8" NPT-27
Transmission To Engine  Chief No 7/16"-14
Tower Bolts  Chief No 1/4"-20
Clutch Sprocket Nut (Inside Transmission)  All Yes 1-3/8"-24
Drive Sprocket Nut  All Yes 1-3/16"-24
Kick Gear Nut (On Trans Mainshaft)  All Yes 1/2"-24
Bellcrank Nut (Shift Arm On Tower)  Chief No 3/8"-24
       
CHASSIS PARTS      
Grease Zerk Fittings  All Yes 5/16"-32
Shock Cover Set Screw  Chief No #10-32
Rocker Clutch Pedal Castle Nut  All No 1/2"-20
Front Motor Mount Nut  Chief No 5/8"-18
Handlebar Control Sleeve Nuts  All Yes 1-3/8"-24 
Fuel Tank Oil Fittings (At Tank)  All No 1/4" NPT
Fuel Shutoff Valve (At Tank)  All No 1/8" NPT-27
Brake Pedal Pivot Bolt (Pre 40) Chief Yes 1/2"-24
Brake Pedal Pivot bolt (40-53) Chief No 9/16"-18
Brake Rod Pivot (Shoulder Bolt At Frame) Chief No 7/16"-20
Tank Emblem Screws  Chief No #2-56
Shock Nuts (Top & Bottom of shaft) Chief Yes 5/8"-24
Shock Nuts (top & bottom of shaft)  Scout  No  7/16"-20 
Chief Main Motor Mount Bolt  Chief  No  5/8"-18 
       
FORK PARTS      
Fork Stem (Leaf Fork)  Chief Yes 1-1/8"-24
Fork Stem (Girder & Telo)  Chief Yes 15/16"-24
Girder Chief Link Nuts  Chief No 7/16"-20
Scout Fork Link Rod Nuts  Scout No 1/2"-20
Leaf Spring Rocker Nuts (Originals Pre 1940)  Chief Yes 1/2"-24
Leaf Spring Rocker Nuts (Originals 1940 & Later) Chief No 1/2"-20
       
ELECTRICAL PARTS      
Generator Drive Pulley Nut (at primary) All No 5/16"-24
Generator Drive Pulley Nut (at generator) All No 7/16"-20
Adjustable Point Contact & Nut  All Yes 3.5x.6 mm
       
WHEELS & HUBS (See Offset Info Under "Misc" Section)      
Front Axle Nut (Girder & Telo Models)  Chief No 5/8"-18
Front Axle Nut (Leaf Models)  Chief No 9/16"-18
Rear Axle Nut  Chief No 9/16"-18
Rear Brake Drum Brg Nut (37-53) LEFT HAND THREAD Chief Yes  
Front Brake Drum Brg Nut (37-45) LEFT HAND THREAD Chief Yes  
Front Brake Drum Brg Nut (46-53) RIGHT HAND THREAD Chief Yes  
Front Hub To Drum Lugs 46-53  Chief No 5/16"-24
Rear Hub To Drum Lugs 37-45 (also Front for 37-45)  Chief No 3/8"-24
Rear Hub To Drum (Studs & Internal Hex Nuts) 46-53 (Drum threads are course, nuts are fine threads) Chief No 5/16"-18/24
Rear Hollow Axle Nut  Chief Yes 7/8"-24
Front Brake Adjuster & Lock Nut (35-53)  All  Yes  1/4"-24 
ANYTHING OVER 3/4", I HAVE MARKED AS "SPECIAL THREAD"
     

Common Parts With Modern Numbers

Part Description Part Number Source/Brand
Generator Drive Belt (Plunger Frame Chief) 4L210 Any Auto Store
Indian Spark Plugs (4093 is non resistor as original) 4093 or 303 Autolite
6 volt tail light bulb (in line pins) 1158 Any Auto Store
6 volt tail light bulb (offset pins for repro light) 1154 Any Auto Store
6 volt Corbin Speedo Bulb (Threaded) 40 Any Auto Store
12 volt Corbin Bulb (Threaded) 1487 Any Auto Store
6 volt fender lamp bulb (bayonet) 63 Any Auto Store
6 volt instrument bulb (bayonet) 51 Any Auto Store
Rotor (Chief/Scout) AL32 NAPA
Points (Chief/Scout) CS709 NAPA
Condenser (Chief/Scout) RR174 NAPA
Distributor Cap (4 Cyl) AL31 NAPA
Distributor Cap (Chief/Scout) AL143 NAPA
Coil 6 volt (internal resistor) GC88 Sorensen
Coil 12 volt (internal resistor) UF-3 Standard
Coil 12 volt (internal resistor) IC14SB NAPA
48+ Regulator 6 volt (some mods required for indicator light) VR-755 NAPA
Pre 48 6 volt cutout CU3 Echlin

        Bearings/Seals

Bearing Part Number/Location New Part Number Brand
Vertical Model Bearing List   Click Here
SS Front Wheel Bearings (cup/cone) 09194/09074 Timken
SS Rear Wheel Bearings (cup/cone) 1729/1779 Timken
24B40 Throw Out Bearing (no races) Balls in Retainer 17J02 INA
38854 Scout lower fork stem bearing (cup/cone) 08125/08231 Timken
39923 Transmission Main Shaft Bearings (Chief)  6207 Fafnir
762010 Transmission Output Seal 16168  CR 
40446 Chief Wheel Bearing 36-53 5205-2RS1 SKF
37605 Chief Wheel Seals 12363  CR 
44046 Brake Drum Bearing 37-53 Chief 5205 SKF
189010 Lower Fork Stem 46-53 Chief 7206 SKF
189005 Upper Fork Stem 46-53 Chief 7205 SKF
38854 Lower Fork Stem (Leaf Models) Chief 08125/08231 Timken
C18120 Upper Fork .250 Ball Bearings (21 reqd) Pre 46 Chief   Any Dealer
191017 46/47 Girder Needle Bearings  Use Bushings  
100631  Distributor Thrust Washer (2 Req'd) TWA815 INA
102481 Distributor Bushing (2 Req'd)    
100229 Generator Bearing (Drive Side) 6202 SKF
100226 Generator Bearing (Comm End)  6201 SKF
39313 Generator Drive (at inner primary) Needle Bearing B810 Torrington
Seal For Above Generator Drive Bearing CR4911 CR
Vertical List of "Off The Shelf" Part numbers (ALSO SEE MISC DATA SECTION FOR MORE VERTICAL INFO) By Rob Garrett Click Here

Misc. Data, Wiring, Bolt Sizes, Carbs & Serial Numbers

Chief wheel offset from FACE OF HUB on non brake side, to CENTER OF RIM Offset
37-45 Chief 2-15/16"
46-53 Chief 2-5/16"
35/36 Chief (18") one piece drum/hub 2-11/16"
Scout wheel offset from brake DRUM FACE to EDGE OF RIM Offset
40 Sport Scout & 741 with 18" rims FRONT 1-1/8"
40 Sport Scout & 741 with 18" rims REAR 1-1/2"
42 Sport Scout with 16" rims FRONT 3/4"
42 Sport Scout with 16"rims REAR 1-1/8"
   
Indian Serial Number Identification Chart Click Here
Linkert, Schebler, Amal Carburetor ID and Data Chart Click Here
Pre 1929 Schebler Carb Listings Only Click Here
Cam ID & Timing guide Click Here
Splitdorf Generator Information Click Here
Splitdorf Magneto Information Click Here
Autolite Generator Information Click Here
Autolite Tag Date Coding Click Here
Autolite Distributor Information Click Here
Vintage Horn Repairs (description & repair instructions) Click Here
Spark Plug Selection & Reading Information Click Here
Cylinder Honing Guide Click Here
Drill Size To Decimal Equivalent Chart Click Here
Drill & Tap Hole Size Guide Click Here
Vard Fork Drawings Click Here
   
Vertical Parts List (Covers 149 Arrow, 249 Scout, Warrior & TT) Provided by Rob Garrett Click Here
   
Transmission Alignment by Bob Courboin Click Here
Bolt Charts By Model-Provided By Ed Glasgow Ed's Web Site
All 10 sheets are contained in one document. Print what you need, or print them all. (76kb) Open All 10 Sheets
     36-39 Chief (336-339)  
     41-42 Sport Scout  
     40-45 Chief  
     41 Chief (341)  
     42 Four Cylinder (442)  
     46 & 47 Chief (346/347)  
     48 Chief (348)  
     50/51 Chief (350/351)  
     53 Chief (353)  
     39-42 Dispatch Tow  
   
Technical Data Books You Should Have In Your Collection  
"The Corbin System"  Repair and Overhaul Data Book
Order Direct from: 
Doc Schuster 24183 Nichols Road, Monroe, OR 97456
$26.95 US/$29.95 Foreign
US funds MO or Check 
Economy rate ppd. Air extra
"The Linkert Book II" Technical Data Book (Order direct from Victory Library for $20) Click Here
Restoration Guide Revisions for 1st edition (by Jerry Hatfield) Click Here
Restoration Guide Revisions for 2nd edition (by Jerry Hatfield) Click Here
   
Wiring Diagrams in PDF Format (printable)  
Photos of Allan Wade's Chief Ignition Switch (disassemled) Ignition Photos
1914 Hendee Special (wiring, frame & starter diagrams in one) 2.22mb 1914 Hendee Special
20-28 Models (Chief, Scout & Prince) 467k 20-28 Models
1927(?) Indian Ace Four Cylinder 36k ACE
1928-1931 101 Scouts (All 3 diagrams) 265k 28-31 101 Scout
1932 Models 203, 303, 403 & 503 All In One 178k 203/303/403/503
1938 Models (338, 438, 638) Chief, Four & Scout 61k 1938
1939 Models (339, 439, 639) Chief, Four & Scout 66k 1939
Sport Scout (most later model 45" Scouts) 70k 40 Sport Scout
340/344 Military Chief With Black Out Lighting 337k 340 Military Chief
640/741 Military Scouts With Black Out Lighting 323k 640/741 Military Scout
841 Military Experimental Model With Blackout Lighting 673k 841 Military
1941 & 42 Indian Four Cylinder (441/442) 73k 41/42 Four
340-346 Chief Models With Cutout Charging System & Ammeter 153k 340-346 Chief
348-353 Chief Models With Voltage Regulator and Charge Light (48-53) 259k 348-353 Chief
149/249 Models (possibly Warriors too) 71k 49-51 Verticals
ND Alternator Connections Diagram (Courtesy of Kiwi Indian) Alternator

Indian Specific Bolt Torques

Head Bolts 7/16" 50-55 ft/lbs Cylinder Base Nuts 35 ft/lbs
Z Flyweel Shafts 100-105 ft/lbs Iron Flywheel Shafts 75 ft/lbs
       

      General SAE Bolt Torques
Use as a general guide only. In most cases, you can use the grade 6 ratings for nut & bolt applications. Be aware of
the materials you are fastening into, as this will affect the safe torque range. Example: The 1/4" primary bolt that
threads into the alloy transmission housing should not be torqued to 10 ft/lbs or you may strip the threads.

 SAE Bolt Grade
Grade 1 & 2
Grade 5
Grade 6
Grade 8
Diameter (below)
 1/4
 5 ft/lbs
7 ft/lbs
 10 ft/lbs
10.5 ft/lbs
 5/16
 9 ft/lbs
14 ft/lbs
 19 ft/lbs
 22 ft/lbs
 3/8
 15 ft/lbs
25 ft/lbs
 34 ft/lbs
 37 ft/lbs
 7/16
 24 ft/lbs
40 ft/lbs
 55 ft/lbs
 60 ft/lbs
 1/2
 37 ft/lbs
60 ft/lbs
 85 ft/lbs
 92 ft/lbs
 9/16
 53 ft/lbs
88 ft/lbs
 120 ft/lbs
 132 ft/lbs
 5/8
 74 ft/lbs
120 ft/lbs
 167 ft/lbs
 180 ft/lbs

Linkert 1-1/4" Carburetor Nozzle (from Victory Library)

Carb Numbers Model Use Hole Pattern (top to bottom) Drill # ID
M640-648 45" Scout #59 #59 #59 #48 #48 #37
M340-348 74" Chief #57 #57 #57 #48 #48 #36
M350-353 80" & Bonnie Chief #55 #55 #55 #55 #55 #29

More Linkert Nozzle Info From Carbs In Use (may have been modified)

Carb Model Model Use Hole Pattern (Top to Bottom) ID
M34x 74" Chief #57 #57 #57 #48 #48 #36
M35x 80"& Bonneville #55 #55 #55 #55 #55 #29
M641 Scout #52 #52 #54 #54 #54 #28
M341 74" Chief #57 #57 #57 #48 #44 #36
M344 74" Chief N/A #57 #57 #48 #44  #27
M344 74" Chief #57 #57 #57 #45 #43 #36
M344 74" Chief #54 #54 #54 #54 #54 #28
M350 80" Chief #57 #57 #57 #48 #44 #36
M350 80" Chief #54 #54 #54 #54 #54 #28
M352 80" Chief #57 #57 #57 #46 #44 #36