Looking to buy... 2004 BDM Chopper

awg

awg

Guru
Well thats a stock EHC..... dont know what the numbers mean that is stamped on the case........and the last pic is the vin #. Never seen that big dog sticker thing on the neck.
 
Rottweiler

Rottweiler

Well-Known Member
Supporting Member
Here is some info. for the Id #
Looks like it is 2004 Chopper # 902


Big Dog Motorcycles, LLC

Service Manual Reference – Page 1
REFERENCE
BIG DOG MOTORCYCLE
VEHICLE IDENTIFICATION NUMBERS (VIN)
Starting Mid-2002 Production
Example VIN: 5J1 1MBJ1 9 4W000001
First Section:
5J1 = The world identifier as assigned by SAE

Second Section:
1 = Type of motorcycle (the same for all models)
M = Model (see model code letters listed below)
B = Engine family type (the same for all models)
J = Net brake horsepower
1 = Standard for all models

Third Section:
9 = This number will be different for each motorcycle

Fourth Section:
4 = Model year (see year codes listed below)
W = Plant location (Wichita)
000001 = Production sequence number

Model Code Letters Year Code Letters
A = Vintage Classic S = 1995
B = ProSport (ProGlide) T = 1996
C = Coyote V = 1997
D = Vintage Light W = 1998
E – AeroGlide X = 1999
F = AeroSport Y = 2000
G = Bulldog 1 = 2001
H = Pitbull 2 = 2002
J = Boxer 3 = 2003
K = Vintage Sport 4 = 2004
L = Husky 5 = 2005
M = Mastiff 6 = 2006
N = Chopper 7 = 2007
P = Wolf 8 = 2008
R = Ridgeback 9 = 2009
T = Chopper - DT A = 2010
Z = Custom


Project Number Identification – Beginning at mid-2001 models, the Big Dog Project Number
corresponds with the VIN.
Example:
VIN = 1B91MBH142W374159
Project Number = M2159
Big Dog Motorcycles, LLC


Service Manual Reference – Page 2
BIG DOG MOTORCYCLE
VEHICLE IDENTIFICATION NUMBERS (VIN)
Prior to Mid-2002 Production
Example VIN: 1B91 MBH 142 W374 159

First Section:
1B9 = The world identifier as assigned by SAE
1 = Type of motorcycle (the same for all models)
Second Section:
M = Model (see model code letters listed below)
B = Engine family type (the same for all models)
H = Net brake horsepower
Third Section:
1 = Standard for all models
4 = This number will be different for each motorcycle
2 = Model year (see year codes listed below)
Fourth Section:
W = Plant location (Wichita)
374 = Manufacturer identifier as assigned by SAE
Fifth Section:
159 = Production sequence number
Model Code Letters Year Code Letters
A = Vintage Classic S = 1995
B = ProSport (ProGlide) T = 1996
C = Coyote V = 1997
D = Vintage Light W = 1998
E – AeroGlide X = 1999
F = AeroSport Y = 2000
G = Bulldog 1 = 2001
H = Pitbull 2 = 2002
J = Boxer
K = Vintage Sport
L = Husky
M = Mastiff
P = Wolf
Z = Custom

Big Dog Motorcycles, LLC


Service Manual Reference – Page 3

HANDY FORMULAS
Pistons (cylinder) displacement = bore x bore x .7854 x stroke
Engine Displacement = piston displacement x number of cylinders
Example: for 80 cu. in. Big Dog Motor
Bore = 3.498”, Stroke = 4.25”, # of cylinders = 2
3.498 x 3.498 x .7854 x 4.25 = 40.8
40.8 x 2 = 81.6 cubic inches
Cubic Centimeters = cubic inches x 16.3871
Example: 81.6 cu. in. x 16.3871 = 1337.2 cubic centimeters (cc)
Compression Ratio = piston displacement + combustion chamber volume*
Combustion Chamber Volume
Example: for 80 cu. in. Big Dog engine
Piston Displacement = 40.8 x 16.3871 = 668.6 cc
Combustion Chamber Volume = 89 cc
Compression Ratio = 668.6 + 89 = 8.5 (to 1) i.e. 8.5:1
89

*Combustion Chamber Volume includes total area above piston at top dead center including area
created by the head gasket. Compression Ratio will vary with gasket thickness.

Horsepower = torque x RPM
5252
Example: Big Dog has estimated the 80 cu. in. motor at 82 ft-lbs of torque at 3600 rpm.
What is the horsepower? 82 x 3600 = 56.2
5252
Torque = horsepower x 5252
RPM
Example: Big Dog has estimated the 80 cu. in. motor at 69 horsepower at 5000 RPM.
What is the torque? Torque = 69 x 5252 = 72.5
5000

CUBIC INCH CHART
STROKE 3-13/16 3.968 4-1/4 4-1/2 4-5/8 4-3/4 5.0 5-1/4
BORE
3.0 53.0 56.1 60.1 63.6 65.3 67.1 70.6 74.2
3-7/16 70.7 73.7 78.9 83.5 85.8 88.2 92.8 97.4
3-1/2 73.3 76.3 81.2 86.6 89.0 91.4 96.2 101.0
3-5/8 78.7 81.9 87.7 92.9 95.5 98.0 103.2 108.4
3-13/16 87.0 90.6 97.0 102.7 105.6 108.5 114.2 120.0
3-7/8 89.9 93.6 100.2 106.1 109.1 112.0 117.9 123.8
4.0 95.8 99.7 1063.8 113.1 116.2 119.4 125.7 131.9
4-1/4 108.2 112.6 120.6 127.7 131.2 134.8 141.9 149.0

Big Dog Motorcycles, LLC
Service Manual Reference – Page 4
DISCLAIMER
S&S, Mikuni, Edelbrock, Terry, Stinger, Compufire, ThunderHeart, Spyke, RevTech,
Champion, Yuasa, Jim’s, Loctite, Dyna, TP, FXR, FLT are registered trademarks of the
respective manufacturers and are used as reference and for instructional purposes only.
This book is not officially authorized or endorsed by any of these manufacturers. The names are
used only for the purpose of identification.
 
Butch Cassidy

Butch Cassidy

Active Member
I know it has a SS 111 motor... any reference info.? I’ve tried searching... but not much info. It seems like a great motor 4” bore and stroke... super g , but EPA regs ended it.. hence the move to FI and the 117. Does that sound about right?
 
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