11.1.1 PREMIER LIGHTWEIGHT: Certain pre-modern era machines, 0-250cc. The following machines are eligible:

Aermacchi

BSA C15

CZ Trial, Type 475

Ducati Scrambler

Eso

Honda CB/CL160, maximum 200cc

Honda CB/CL72

Jawa

Maico with OEM iron barrel

Matchless G2

Parilla Wildcat

Triumph Cub

Triumph Tiger 70

Villiers-powered machines (Greeves, Dot, James, Norman, Francis-Barnett, etc.)

a) Ineligible are all models of Yamaha, Suzuki, Bultaco, Ossa, Montesa, alloy-barrel Maico, Husqvarna and Greeves (unless Villiers powered). Refer to Sportsman and Classic classes.

b) Replacement frames, including Cheney, Rickman and replicas, are not allowed. Standard frames may have period modifications.

c) Premier Lightweight machines are restricted to expansion chambers of period technology. The head pipe must be of constant diameter, and the chamber must have two cones maximum of constant angle, with no constant-diameter center section.

11.1.2 PREMIER 500: Certain pre-1965 and like-design, non-unit construction (removable gearbox) of 350-500cc and unit construction of 360-500cc. (Eligible exceptions: Matchless or AJS 600cc single using original, non-Norton oil pump crankcases with standard stroke and bore (+.080"); BSA B40 with original iron cylinder and left intake port head; and Eso 500.) Examples of eligible machines include:

BSA A7 twin

BSA 500 singles

Ducati 350 narrow case (standard stroke); see below

Matchless G80, G50

TriBSA, MaBSA, etc.

Triumph T100 pre-unit; may use 650 crankshaft with maximum .020" overbore.

Triumph 500 unit-construction twin; see below

a) To better preserve the machines of this era, standard frames are encouraged. However, TriBSA specials, and period aftermarket units such as Rickman (MkIII max), Cheney, or accurate replicas, are eligible. Standard frames may have period modifications.

b) The unit construction BSA B40 is intended as an entry-level machine in the Premier 500 class. The standard frame must be used. The swingarm may be changed to period aftermarket products or modified in a period manner. The original rear hub or a BSA QD hub and brake must be used. Extensive modification to improve power or reduce weight will move the machine to the Classic 500 class.

c) Ducati 350 narrow case machines are intended as entry level and must use the standard frame and rear wheel. Extensive modification to improve power or reduce weight will move the machine to Classic 500.

d) Triumph unit-construction twins are intended as entry level and must include the following: The frame must be the pre-1966 Triumph 500 "gooseneck" design (first used the gas tank as a structural member of the frame and later used a bolt-in backbone piece that runs from the top of the steering head stock to the tank/seat junction). The stock Triumph rear hub must be used. The engine must be of the type that uses a bushing on the timing side of the crank’s mainshaft, although it is not necessary to utilize the distributor-type ignition. The cylinder head must be of the pre-’67 "squishband" type.

11.1.3 PREMIER OPEN TWINS: Certain pre-1965 and like-design non-unit construction (removable gearbox), four-stroke machines with two or more cylinders, manufactured as 600cc and larger. The following machines are eligible:

BSA A10 twin

Matchless 600, 650 and 750 twin

Norton 650, 750 and 850 twin

Triumph 650 twin

a) To better preserve the machines of this era, standard frames are encouraged. However, TriBSA specials, and period aftermarket units such as Rickman (MkIII max), Cheney, or accurate replicas, are eligible. Standard frames may have period modifications.

11.1.4 CLASSIC 125: 88-125cc two-strokes and four-strokes 88-150cc, manufactured through December 1971 and any like machines. Eligible machines include:

American Eagle Tyran 125 (Sachs)

Ancilotti, Sachs or Morini powered

Bultaco, up to Sherpa S 125

Carabela

CZ, ‘71-75

DKW

Harley-Davidson 100 and 125

Hodaka, all 100s and 125s (except as noted below)

Honda CB/CL/SL up to 150cc

Honda XL100K1

Husqvarna, ‘72-74

KTM, ‘71-72 Sachs engine

Maico, ‘72-74 square barrel only

Monark, ‘71-74

Montesa Cappra

Pentons with Sachs engine

Puch, all

Rickman Zundapp, all

Rupp 125 with Sachs motor

Sachs, all

Suzuki TS100/125

Wassell, all Sachs-powered

Yamaha AT1

Any motorcycles powered by Sachs engines 125/5A or 6A, 125/5B or 6B. Note: Due to a misunderstanding, the Sachs 6D engines have been running in Classic 125 without domination. The engines will be allowed in the class on a probationary basis in 2007, with a request for more member input per the normal rulemaking process for 2008.

Ineligible Classic 125 machines are:

All Japanese except those listed above

Bultaco Pursang 125

Can-Am, all

‘74 Hodaka Super Rat and Super Combat

Ossa Phantom

Pentons with KTM engines

a) The only acceptable change from the OEM frame is to use "specials" no newer than 1972.

b) No major engine components may be changed or updated to later-model parts (i.e., cylinder head, barrel, cases, etc.). Reed valves are not allowed. Carburetors on two-strokes may be no larger than 32mm. Any OEMexhaust may be used only on the original machine; any replacement of original exhaust must be made of up to four rolled cones and a single-diameter center section and a single-diameter head pipe.

c) Four-stroke Hondas may be increased to 150cc plus .020" overbore, but must use 1971-type crankcases, the small-valve one-piece cylinder head, and contact breaker point ignition.

d) 100cc two-strokes may be increased to 125cc.

e) Honda leading-axle forks are not eligible.

f) Anyone with a purpose-built machine, or one which is later than December 1971 but may be a "like" model, should submit an eligibility request form.

g) Machines which exhibit unusual performance may be required to run in Sportsman 125.

11.1.5 CLASSIC 250: Certain machines introduced just after the Premier Lightweight era. Also included are heavy 350cc non-unit-construction four-strokes. Eligible machines are:

AJS Stormer

American Eagle 238 Greenstreak

Bultaco four-speed, including Metisse

CZ twin pipe

Greeves Challenger/Griffon with cast-beam or steel frame

Honda CL175, SL175

Husqvarna "bolt-together" four-speed (pre-’68 only)

Kawasaki 238 Greenstreak

Maico oval barrel

Montesa four-speed

Ossa four-speed

Rickman Montesa four-speed (see below)

Any all-alloy 250cc BSA or Triumph

Any 350cc non-unit-construction four-stroke such as Matchless, BSA, Ariel and Eso

Suzuki TM-250 twin-pipe

a) Rickman or Cheney frames may be used with the above engines. Only Rickman MkIII, MkIV or Petite Metisse may be used. Original four-speed Rickman Montesas (up to frame #1824 and fitted with 53M-series engines) are allowed, but must retain their original Metal Profiles forks, Rickman hubs and exhaust pipe (or an accurate replica of the OEM pipe); replica bikes utilizing later Rickman frames originally built for five-speed engines are not allowed. Any "special" built from any Rickman Montesa chassis and any other engine runs in the Sportsman class. 1973-74 CCM or Dick Mann frames are eligible.

b) Ineligible are "bolt-together" enduro Husqvarna or any major components from this machine; single-port CZ; Japanese makes with single-cylinder, two-stroke engine, or five-speed transmission.

c) No major engine components may be changed or updated to later model parts (i.e., cylinder head, barrel, cases, etc.).

d) No machine may use a carburetor larger than 32mm, except 33mm IRZ on Ossa only. No reed valves allowed.

e) Any replacement of the original expansion chamber must be of period design, with only two cones maximum of constant angle. The center section must be of constant diameter and the head pipe must be of constant diameter until it meets the opening cone. Fitting a more modern expansion chamber will move the machine to the Sportsman class.

11.1.6 CLASSIC 500: Certain 500 class machines introduced just after the Premier 500 era. Eligible machines are:

Aermacchi/Harley-Davidson 350

AJS 370 and 410

American Eagle 360

Bultaco 350/360 El Bandido and Montadero

CZ 360 twin port

Ducati wide case 350/450

Greeves 360 or 380 twin-port in cast-beam or steel frame

Honda CL77, CL450 and CB450

Husqvarna 360 bolt-together, pre-1968 only

Maico 360 oval barrel

Montesa 360 Cappra, cylinder prefix 36, 46

Any BSA B44, 441 Victor in any BSA-designed frame

BSA B44 with Weslake conversion

Any Triumph unit-construction 500 twin in any BSA-or Triumph-designed frame

a) Rickman or Cheney frames may be used with the above engines. Only Rickman MkIII, MkIV or Petite Metisse may be used. Rickman Montesa and Rickman 125 Zundapp are not eligible. 1973-74 CCM or Dick Mann frames are eligible.

b) Ineligible are: BSA B50, CCM or Triumph variants; bolt-together enduro Husqvarna or any major components from this machine; single-port CZ; square-barrel Maico; single-port Greeves QUB.

c) No major engine component may be changed or updated.

d) Any AHRMA-legal carburetor may be used; no reed valves allowed.

e) Any replacement of the original expansion chamber must be of period design, with only two cones maximum of constant angle. The center section must be of constant diameter and the head pipe must be of constant diameter until it meets the opening cone. Fitting a more modern expansion chamber will move the machine to the Sportsman class.

11.1.7 SPORTSMAN 125: 88-125cc two-stroke and 88-150cc four-stroke motorcycles through the 1974 model year, and like-design machines. Eligible like-design 1975 model machines include (see Note below):

Bultaco, see note at end of Sportsman rules

Can-Am 125 TNT

Honda CR125

Kawasaki KX125

Suzuki TM100, TM125

Yamaha YZ125, MX125

11.1.8 SPORTSMAN 250: Motorcycles manufactured as126-250cc two-strokes or 151-300cc four-strokes through the 1974 model year, and like-design machines. Eligible like-design 1975 model machines include (see Note below):

Bultaco 250 Pursang (serial #135; must use 1974-configuration swingarm). Also see note at end of Sportsman rules.

Can-Am175 TNT, 250 TNT (also 1976 175 TNT/OR). 250cc engines must have 57.5mm stroke

CZ 250 Falta (1974-configuration swingarm encouraged)

Honda MT250

Husqvarna 250WR

Kawasaki KX250 (also 1976)

Ossa Desert Phantom 250 (1974-configuration swingarm encouraged)

Suzuki TM250 (1974-configuration swingarm encouraged), also TS model

Yamaha MX175

11.1.9 SPORTSMAN 500: Motorcycles manufactured as 325-625cc through the 1974 model year, and like-design machines. Eligible like-design 1975 model machines include (see Note below):

Bultaco, see note at end of Sportsman rules

CZ Falta (1974-configuration swingarm encouraged)

Husqvarna 400WR

Kawasaki KX400 (also 1976), F5 Bighorn

Suzuki TM400 (1974-configuration swingarm encouraged), also TS model

Honda SL 350 and CL360 also are eligible for Sportsman 500.

11.1.10 SPORTSMAN OPEN TWINS: Unit-construction or pre-unit, four-stroke motorcycles with two or more cylinders through the 1974 model year, and like-design machines, manufactured as 600cc and larger (see Note below).

NOTE: Like-design Sportsman machines:

a) 1975 Maicos are not legal for AHRMA vintage competition, although the 1975 frame may be used as a replacement for the 19741/2 GP models. The ‘741/2 fork assembly, swingarm, hubs and engine must be retained. Any and all 1975 models must meet the 7-inch-front/4-inch-rear wheel suspension travel requirement—measured at the axle.

b) 1975 Bultaco model 134-136, 143 and 144 frames may be used as replacement frames in Sportsman. Swingarm must be pre-1974, 4-inch travel.

The Sportsman eligibility list is now complete with regard to non-like-design post-1974 machines. However, proposals for inclusion of like-design machines are always welcome.

11.1.11 Open Age: Any AHRMA-eligible rider on any size or type of AHRMA-eligible vintage machine.

11.1.12 +40: Any rider over 40 years of age on any size or type of AHRMA-eligible vintage machine.

11.1.13 +50: Any rider over 50 years of age on any size or type of AHRMA-eligible vintage machine.

11.1.14 +60: Any rider over 60 years of age on any size or type of AHRMA-eligible vintage machine.

11.1.15 +70: Any rider over 70 years of age on any size or type of AHRMA-eligible vintage machine.

NOTE: A rider may not advance to the next age-related class until after that birthday. Due to difficulties in laying out the race-day program, competitors may enter no more than two rider-age classes.

11.1.15 WOMEN: Riding any size or type of AHRMA-eligible vintage machine.

11.1.16 At the MX coordinator’s discretion, non-AHRMA support classes may be run at local and regional events only. Support races must run at the end of each round of motos to preserve the integrity of AHRMA’s race day schedule and the track surface Any support classes and support-class practice sessions must run separately from the AHRMA classes. These classes will not run at National events. With the addition of the AHRMA Post-Vintage MX program, coordinators are encouraged to use these as support classes. See Section 12. Only official AHRMA classes are to be run at Nationals. Any exceptions must be approved in advance by the Executive Director.

a) SUSPENSION: All machines must have no more than 7 inches of front wheel travel and 4 inches of rear wheel travel, measured at the axle, regardless of original specification. The field check for rear wheel travel is as follows: 1) Both shocks are removed from the bike, then one bare (without spring) damper unit is reinstalled. 2) The machine is supported in such a fashion that the rear suspension is at maximum extension, and a measurement is taken from the center of the rear axle to a point marked directly above the axle on the rear fender or subframe. 3) With both wheels on the ground, the rear suspension is fully compressed by the examiner with the rider aboard to compress any rubber bumpers; a measurement is again taken from the center of the rear axle to the same marked point above. 4) The measurement obtained in step 3 subtracted from the measurement in step 2 is the wheel travel.

An alternative method of determining wheel travel may be used by tech inspectors using a pre-programmed computer. The program converts three dimensions—distance from swingarm pivot to rear axle, to lower shock mount and top shock mount—to show the amount of travel of the shock shaft plus 50 percent of the rubber bumper. Due to the use of non-standard or different types rubber bumpers, this check may be overridden by the tech inspector’s discretion. Manual measurement of shock movement is the overriding factor in determining whether a shock is legal.

To help preserve the motorcycles and represent the era, stock shock mount positions are strongly encouraged. Forward-mounted or laydown shock mounts will be closely scrutinized and checked for travel, with three-fourths of the rubber bumper counted as shaft travel.

b) Engines: Modifications are many, though they must be consistent with the spirit of the period and class.

c) Carburetors: Flat-slide or Lectron type and injection type carburetors are not permitted. "Power Jet" and "Pumper" type carburetors are not permitted unless such mechanisms are disconnected or removed. Fuel injection is not permitted. Period carburetors are encouraged. Smoothbores with concentric float bowls are not permitted, except where they were fitted as original equipment or supplied as factory kits on that model motorcycle. Modern replacement smoothbore carburetors are not permitted.

d) All motorcycles must be equipped with a functional handlebar-mounted electrical or mechanical kill switch.

e) Footpegs must be folding type and should fold back at a 45-degree angle.

f) Side stands and protruding lugs must be removed or rubber-covered. At the discretion of the Tech Inspector, certain side stands which are completely tucked away may be left in place but must be safety wired or strapped in the folded position.

g) Disc brakes are prohibited (except Rokon OEM). Hydraulically assisted drum brakes are prohibited.

h) Paddle-type tires are prohibited.

i) All two-stroke machines must be fitted with efficient silencers. The only exception is Premier machines fitted with "blooie" pipes.

j) Minicycles are prohibited. All machines must have a minimum OEM wheel size of 17 inches.

k) Swingarms in the Premier and Classic classes must be steel. The only exception is the period cast aluminum swingarm made by A&ARacing for BSAunit singles.

l) All modifications must be consistent with the spirit of the class and period.

m) No major components may be later than 1974 (i.e., frame, forks, engine, gearbox, wheels, etc.) The burden of authenticating is on the rider. Press clippings and photos with identifiable dates may be helpful. Premier machines are restricted to Premier-type frames.

n) Appearance and workmanship of a reasonable standard shall be enforced.

o) NUMBERS AND NUMBER PLATES:All machines must display three number plates—one mounted on the front and one on each side mounted in a way that it will not be blocked by the rider.

p) In addition to the rules in Section 11, riders must comply with all applicable rules in Sections 3 (events and race procedure), 4 (entry procedure) and 6 (offenses, penalties, protests and appeals), rule 9.7.11 (fuel) and rule 9.7.17 (AHRMA decals; two required and may be placed on any readily visible part of the motorcycle).

a) It is AHRMA's intent that rider ability levels are standardized within each region and across the nation.

b) Riders are graded by a committee of their peers and will be advanced only if their ability is deemed to be well above the other competitors in their class. A rider can also be moved to a lower class, in special instances, by the same method. If a rider's placement in a class is obviously wrong, that rider can be moved at any time. The executive director will make the final determination in any dispute over rider grading.

c) Each region will appoint a Regional Rider Grading Chairman and a minimum committee of one Novice, one Intermediate and one Expert. The committee will perform an annual review of ability levels, but may make an immediate ability level change with a three-member quorum. The committee has overall authority and responsibility for rider ability levels in its region, whether or not a specific rider competes in its regional series.

d) Any three regional grading committee members present at a national event can make a grading decision on the spot. If the rider’s home regional committee disagrees with the decision, it can be appealed to the executive director.

e) Riders who are new to AHRMA motocross must sign up as at least an Intermediate until status is confirmed by the grading committee, optimally at that rider's first event. This is done by interview or observation at the request of the new competitor. Final determination of points scored in national or regional events will not be made until status is confirmed.

f) A rider may move up a skill level at his discretion. However, no rider may move back a skill level without permission from the AHRMA grading committee.

g) So that rider skill levels are recognizable, a vertical stripe approximately 2x6 inches must be placed in the center of the rear of the helmet, with the lower end of the stripe even with the base of the helmet. Such stripes are available at tech inspection.

Novice Red

Intermediate Yellow

Expert Black

Riders with dual ability levels must clearly display both helmet stripe colors. If a rider is observed competing without a helmet stripe, a penalty of one position may be imposed in that moto.

h) If the rider grading committee deems it appropriate, riders in the +50 and +60 classes may have a dual ability level, with a lower rating in the Sportsman classes only. Riders in the +70 class may apply to the rider grading committee for a lower ability rating in any class but +60. Women may apply to the rider grading committee for any lower ability rating in any class but Women. (An Expert woman, for example, could be classified as a Sportsman Novice.) Dual ability levels are granted only by the rider grading committee and must be listed on the rider's competition card.

a) The Olympic scoring method is used for each moto: 1 point for first, 2 points for second, 3 points for third, etc. The smallest score wins.

b) Riders must complete at least one full lap to be scored.

c) A non-starter is anyone who does not complete one full lap, following the circuit in its entirety; a DNS receives no points. A non-finisher is anyone who completes one full lap but does not reach half-distance of the race; a DNF receives last-place points plus two positions, to avoid scoring problems. A finisher is anyone who completes at least half the number of laps completed by the class winner in a moto (e.g., three laps of a five-lap moto); points are paid in the order of finish. If there are fewer than three entrants in a class, the winner must complete at least half the prescribed race distance (track conditions allowing, as determined by the referee or race director), to receive first-place points.

d) Each race concludes with the display of the checkered flag, even if a competitor believes the number of laps is not consistent with pre-race instructions. If there has been a flagging error, the race referee may revise the results if he deems it appropriate.

e) Ties are decided by the finishing position in the last moto.

f) If two classes are run together in one race, a rider may ride one motorcycle in one class and be scored in the other class, provided the machine is eligible and entered in that other class. The rider shall start from the least favorable wave or grid position.

g) The rider, not the motorcycle, is the entry. A rider may switch to a second eligible motorcycle for the second moto in a given class.

h) If there are too many entrants for one moto, a class will be split at random and run as if there were two separate events. Series points will be awarded as if there were two separate events.

i) If a rider believes there is an error in scoring, he or she must make a written protest and deliver it to an AHRMA official or referee within 30 minutes of the results being posted. Unprotested results will stand. Any discrepancies will be resolved at the track if possible, or later if required. This process is subject to appeal.

a) Points will be awarded according to each moto finish, without regard to rider’s overall performance for the day.

b) A rider will receive points if he or she is the sole class competitor.

c) A rider must score points in at least two events to be eligible for series awards, or according to requirements as published in Vintage Views from time to time.

d) The following points are awarded for each moto’s placing.

e) Year-end scoring ties will be broken as follows: Year-end scoring ties will be broken by the greatest number of moto wins, then second-place moto finishes, third-place, etc. In the event of an absolute tie, the oldest rider wins.

f) In the event that only one moto is run, double points will be awarded.

g) National-championship events also award regional-championship points for the region in which the event takes place.

a) Engine-displacement class bumping is prohibited (e.g., no 250s in the 500 class). Bumping up into later era classes is permitted, provided the machine is of corresponding engine size (e.g., Classic 500 into Sportsman 500 in Vintage or Historic 125 into Gran Prix 125 in Post-Vintage).

b) During an event it is expressly forbidden to ride any vehicle in the direction opposite to that in which the event is being run without specific approval of a race official.

c) In the event that a rider leaves the marked racetrack, every effort should be made to reenter the track at the same place he/she exited. If this is not possible, the rider must reenter in a safe manner, before the next track marker, without improving his/her position in relation to other competitors. If time or position is gained, the penalty will be left to the discretion of the referee.

d) A red flag means the race has been suspended. Competition must cease immediately, with all riders slowing to a safe speed and proceeding in a safe manner to the starting area, where an official will give further instructions. If a race is called complete by a red flag, scoring will revert to the last lap completed by all competitors.

e) All events where a "rubberband" start is used, riders must have their front wheel in the ditch at the time the rubberband is released. Failure to do so can result in a loss of three finishing positions, at the discretion of the referee.

f) A yellow flag indicates a dangerous situation on the track ahead. Competitors are cautioned to ride accordingly. The intent of this rule is that riders may not use this situation to an advantage.