its a start. circa 2005:
7.D CLASSIFICATION OF DISPLACEMENTS, FRAMES, ENGINES, AND ENGINE TYPES:
Note: Motorcycle classes are listed in order of displacement, frame type and engine type.
7.D.1 Designation Frame Class
P Production
M Modified
A Special Construction
MPS Modified Partial Streamlining
APS Special Construction Partial Streamlining
SC Sidecar
SCS Sidecar Streamliner
S Streamliner
7.D.2 Designation Engine Class
P Production
PP Production Push Rod
PB Production Supercharged
PV Production Vintage
G Modified Engine: Gasoline
PG Push Rod Engine: Gasoline
VG Vintage Engine: Gasoline
UG Unlimited Engine: Gasoline
BG Supercharged Engine: Gasoline
PBG Supercharged Push Rod Engine: Gas
VBG Supercharged Vintage Engine: Gasoline
F Modified Engine: Fuel
PF Push Rod Engine: Fuel
VF Vintage Engine: Fuel
UF Unlimited Engine: Fuel
BF Supercharged Engine: Fuel
PBF Supercharged Push Rod Engine: Fuel
VBF Supercharged Vintage Engine: Fuel
Steam, Turbine or Electric
ENGINE DISPLACEMENT CLASSES
Engine Classes are shown in cubic centimeters, i.e., 50, 100, 125, 175, 250, 350, 500, 650, 750, 1000, 1350, 1650, 2000 and 3000 where permitted and 3001 and above where permitted.
7.D.4 Permitted Classes and Engines
P P, PP, PB, PV 2000 1
M All except U 2000 1
MPS All except U 2000 1
A All except U 3001 & above 2
APS All except U 3001 & above 2
S All 3001 & above 2
SC All except P, PP, PS, PV, G 3001 & above 2
SCS All 3001 & above 2
Classes defined and not restricted under items 4A, 4B, 4C, and 4D are open for
competition. Requests for rule changes should be submitted to the Rules Committee
using the Request for Rules Consideration form (available from the committee members
or inspectors). A motorcycle rules conference will be held at Bonneville during Speed Week and at El Mirage during the September meet. Notice of dates, times, and locations
will be posted at the registration trailer.