The rules permit a 50% displacement advantage to flathead motors, as used in pre-1970 AMA Class “C”, not the previously used drop of two classes. This can be calulated as: OHV = SV × 66.67%, OHV = SV - 33.33%, SV = OHV × 150%, or SV = OHV + 50%. The flathead motor size appears below the OHV size in each column:
Displacement Limits |
Class |
VG/F-1350 |
VG/F-1000 |
VG/F-750 |
VG/F-650 |
VG/F-500 |
VG/F-350 |
VG/F-250 |
Size |
CC | Inch |
CC | Inch | CC | Inch | CC | Inch | CC | Inch | CC | Inch | CC | Inch |
Overhead Valve |
1350 | 82.4 |
1000 | 61.0 |
750 | 45.8 |
650 | 39.7 |
500 | 30.5 |
350 | 21.6 |
250 | 15.3 |
Side Valve |
2025 | 123.6 |
1500 | 91.5 |
1125 | 68.7 |
975 | 59.5 |
750 | 45.8 |
525 | 32.0 |
375 | 22.9 |
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Vintage Engine Rules:
Unlimited in design, but must be comprised of major parts and components designed primarily for use in motorcycle engines.
7.J.10 Class VG and VF: Same as Class G or F, except that the class is limited to motorcycle engines produced prior to 1956. For reasons of historical authenticity, vintage engine modifications are restricted to older technology levels, so far as is practical. Accordingly, in classes VF, VG, VBF and VBG, newer technologies, such as EFI or electronic reactive ignition systems, are not in keeping with the spirit of the Vintage Classes and are not allowed. Computers are allowed for data collection purposes only.
Engines must utilize O.E.M. crankcase, O.E.M. cylinders on flatheads and two strokes and O.E.M. heads on O.H.V. engines. Above components made after 1955 and exact reproductions may be considered legal in Vintage classes if they offer no competitive advantage. Pre installation approval by the contest board is required. It is the entrant's responsibility to provide documentation and samples. A .050 inch overbore is allowed on vintage engines only (including production vintage) and will be discounted when the bore size is measured.
Flathead engine displacement will be discounted 33 1/3 in determining engine displacement class limits. For example a 1500cc measured displacement would run as a 1000cc.
General Rules:
A) Number/Classes: Two (2) designation plates are required, one on each side. Minimum plate dimensions are 6” high and 8” wide with the four corners cut off at a 1” radius. Plates must be securely mounted and completely visible from either side while the rider is in the riding position. All numbers must be a minimum of 5” high and 1” wide and letters at least 2” high. Partial streamliners may have an area 6” high and 8” wide (minimum) panel on both sides of the fairing in lieu of plates. Class designation must be clearly displayed on the plate.
B) Kill Switch and Fuel Shutoff: All motorcycles must have a positive off, kill switch which must be able to stop a running engine and remain shut off and be operated without removing the hands from the handlebar(s). Also required is an ignition kill switch and a fuel pump shut off, both actuated by a lanyard attached to the rider. Gas motorcycles must have a fuel shutoff operable from a normal riding position. All unvalved portions of fuel or gas lines (including saddle tank crossover lines) must have fire resistant or fireproof connecting lines and fittings. Aeroquip fire sleeve covers meet this requirement.
C) Throttle: A self-closing throttle must be fitted to all motorcycles.
D) Controls: Control levers must have at least a 1/2” diameter round ball end. The handlebars must locate the hands outside the width of the fork tubes (6” minimum). It is suggested that the configuration of the handlebars locate the thumbs at least 10” apart. Fork stops must stop fork travel before the hands touch the tank or fairing. If a hydraulic steering damper is used, the rod shaft (or piston) may not be used for the fork stops.
E) Headlight: Glass headlights must be taped to retain breakage and the tape is limited to the glass lens. To avoid heat build up, lamps may be rendered inoperative.
F) Mirrors: Must be removed unless integrated into the fairing. The glass in the integrated mirrors must be taped or removed.
G) Foot rests: Foot rests must be provided as per requirements of the class entered and the rider must use them during the entire run.
H) Tire requirements: Tires used are governed by the record speed in the class entered and cannot be used beyond the speed rating of the tire. Tubeless, bias ply type tires may be run with tubes. Speed ratings will be reduced one speed range, unless otherwise indicated by the tire manufacturer. It is the responsibility of the entrant to check inflation pressures and tire and wheel condition immediately before and after every run.
0 to 125 MPH: Standard production tires of road tread are permitted.
126 to 150 MPH: Current production V rated or better tires of standard road tread are permitted.
151 to 200 MPH: Road racing branded and Z rated tires are permitted.
Tubes are not permitted in radial tires.
I) Metal valve caps: All tire valve stems must be fitted with metal valve caps. Valve stems that are angled, relative to the rotational plane of the wheel, must be secured to resist contrifugal force deflection. Safety wire or other restraining device is required.
J) Wheels: It is REQUIRED that front wheels be cross ventilated. No wheel discs are permitted.
K) Gasoline: The addition of a power additive or changes of any nature, other than oil designated for lubrication only, to GASOLINE is prohibited. Penalty for violation of this standard shall be disqualification. Refer to Section Il-2 Fuels for specifications.
M) Engine size: Displacement must be greater than the maximum allowable for the next lower class.
O) Taping: The taping of the fork stanchions to a spoiler shape or adding taped spoilers to a machine is not permitted in any class.
P) Axle nuts: All axle retaining nuts, pinch bolts and axle caps must be safety wired or otherwise secured by visually verifiable means. Lock washers, self locking nuts or thread locking compounds do not meet this requirement.
Q) Tow Starts: Dead motor tow starts will not be permitted. This requirement includes designated warm up areas.
R) Steering Damper: Required in classes where the existing record is over 125 MPH and all entries at El Mirage.
S) Seat and Saddle: No part of the seat or saddle or anything to the rear of these may be more than 36” above the ground when the motorcycle is loaded.
T) All steering, suspension, and control linkage components and frames must comply with Section III, 12 Technical Requirements, unless clearly not applicable to motorcycle configurations.
3.) Riding Apparel: All motorcycle riders are required to use the following riding equipment, except where clearly inconsistent with Full Streamliner rules.
A) Driver's Helmet: All drivers/riders must wear a full face helmet with face shield which meets Snell Foundation 1995 or later specifications. No open face helmets will be allowed. Helmets will be visually inspected at least once each year. Helmets must be undamaged and in serviceable condition. Eyeglasses worn under the helmet must be shatterproof.
Riders must demonstrate proper helmet fit and “roll off” resistance.
B) Leathers: One piece leather or other materials certified by a recognized manufacturer to be suitable for the application is required. Two piece suits zippered together are allowed.
C) Boots: Zipper, buckle or lace up leather boots of substantial construction suitable for motorcycle use are required and must be at least 8” high.
D) Gloves: Leather gloves are required. No perforated or skeleton gloves are permitted.
Modified Frame Rules:
Frames must be based on an OEM street-type frame or production replacement having similar geometry. The maximum wheelbase is 72 inches for those over 250cc.
Modifications may include alteration of steering head angle and/or wheelbase, and the removal or addition of mounting brackets and braces.
At least 50% of the original structural members forward of the rearmost portion of the engine/gearbox must be retained. All components must have sufficient strength to ensure stability and safety. Weld integrity and fabrication methods will be closely scrutinized during the inspection process.
Prior to performing any modifications, it is strongly suggested that the modifier submit final design prints or sketches to the Technical Committee for evaluation of rules compliance and safety considerations.
The handlebar grips and seating position must not be lower than a horizontal line drawn even with the uppermost portion of the wheel rims. Original lights, instruments, fenders, gas and oil tanks (if applicable), seat, forks, swing arm, shocks, brakes and wheels are all optional.
1) Foot rest: Must be ahead of the rear axle at least by 6”.
2) Mufflers and exhaust pipes: Optional exhaust pipes may not extend behind rear edge of rear tire.
4) Fenders: Front fender and rear portion of rear fender may be removed or special fenders may be fitted. Such special fenders must be made and attached in a workmanship-like manner. Rear fenders shall extend to a point not less than a vertical line drawn through the rear axle. A seat that covers the rear wheel to the vertical line may substitute for fender requirements.
5) Gas tanks: If not original equipment to the model engine used, must have a minimum capacity of 5 liters or 1.32 gallons.
6) Wheels: Replacement wheels must have a minimum nominal rim diameter of 15”. All axles must be of steel alloy or titanium.
7) Forks: Must be of sufficient strength for the motorcycle in question. Center hub steering and equivalent or derivative of this design is not permitted in this class, unless factory produced for the model.
8) Brakes: Front brakes are not required. Rear brakes are required and must be an internal expanding drum type or hydraulic actuated disc brake. Actuation may be from foot peg or handlebar.
9) Chain guard: All chain or belt drives must have a guard on the top run at least 1-1/2 times the overall width of the chain or at least 1/4” wider than the belt. Guards must run from the center of the front sprocket to the rear most edge of the rear sprocket measured vertically. Primary guards must have a side cover to prevent rider from getting entangled in the drive.
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