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RULES

  1. Introduction
  2. MA Structure
  3. General Competition Rules And Making Rule Changes
  4. Jurisdiction s
    1. 1.1 Definitions
    2. 1.2 Purpose of Rules
    3. 1.3 Repeal of Current Gcrs
    4. 1.4 by Laws
  5. Administration s
    1. 2.1 The Controlling Bodies
    2. 2.2 Sports Development Levy
    3. 2.3 Sports Development Account
    4. 2.4 Officials
  6. Licensing s
    1. 3.1 Licensing Requirements
    2. 3.2 Licensing General
    3. 3.3 Licensing Seniors
    4. 3.4 Licensing Juniors
    5. 3.5 Licensing Entrants
    6. 3.6 Licensing Speedway Mechanics
    7. 3.7 Licence Issuing And Renewals
    8. 3.8 Junior Coaching Program
  7. Competitions s
    1. 4.1 Venues
    2. 4.2 The Promotion And Conduct of Competitions
    3. 4.3 MA Events
    4. 4.4 Protocols
  8. Alternative Forms of Competition s
    1. 5.1 Alternative Activities
    2. 5.2 Venues Alternative Activities
    3. 5.3 Permits : Alternative Activities
    4. 5.4 Supplementary Regulations Alternative Activities
    5. 5.5 Licensing of Competitors Alternative Activities
    6. 5.6 Technical Specifications Alternative Activities
  9. Recreational Motorcycle Activity s
    1. 6.1 Purpose
    2. 6.2 Recreational Activities
    3. 6.3 Controlling Bodies Recreational Activities
    4. 6.4 Officials Recreational Activities
    5. 6.5 Venues Recreational Activities
    6. 6.6 The Promotion And Conduct of Recreational Activity
    7. 6.7 Permits Recreational Activities
    8. 6.8 Entries
    9. 6.9 Licensing of Participants
  10. Offences Protests And Appeals s
    1. 7.1 Offences
    2. 7.2 Protests
    3. 7.3 Appellate Bodies
    4. 7.4 Appeals
  11. Judicial Committee Guidelines s
    1. 8.1 MA Hearing Guidelines
  12. National Personal Accident Insurance s
    1. 12.1 Summary of Policy Coverage
    2. 12.2 Capital Benefits
    3. 12.3 Weekly Benefits
    4. 12.4 Definitions
  13. Road Racing s
    1. SECTION 13 A: AUSTRALIAN CHAMPIONSHIPS
    2. SECTION 13 B: COMPETITION CLASSES
    3. SECTION 13C: COMPETITION RULES
    4. SECTION 13 D: TECHNICAL REGULATIONS
    5. SECTION 13 E: TECHNICAL REGULATIONS: SOLO CLASSES
    6. SECTION 13 F: TECHNICAL REGULATIONS: SIDECARS
    7. SECTION 13 G: TECHNICAL REGULATIONS: JUNIOR CLASSES
    8. SECTION 13 H: MINIMOTO
  14. Historic Road Racing s
    1. SECTION 14 A: AUSTRALIAN CHAMPIONSHIPS
    2. SECTION 14 B: COMPETITION CLASSES
    3. SECTION 14 C: COMPETITION RULES
    4. SECTION 14 D: TECHNICAL REGULATIONS: GENERAL
    5. SECTION 14E: TECHNICAL REGULATIONS: PERIOD
  15. Motocross And Supercross s
    1. SECTION 15 A: AUSTRALIAN CHAMPIONSHIPS
    2. SECTION 15 B: COMPETITION CLASSES
    3. SECTION 15 C: COMPETITION RULES
    4. SECTION 15 D: TECHNICAL REGULATIONS
  16. Classic Motocross And Dirt Track s
    1. SECTION 16 A: AUSTRALIAN CHAMPIONSHIPS
    2. Section 16 B Competition Classes
    3. SECTION 16 C: COMPETITION RULES
    4. SECTION 16 D TECHNICAL REGULATIONS
  17. Enduro And Reliability Trials s
    1. SECTION 17A: AUSTRALIAN CHAMPIONSHIPS
    2. SECTION 17B: COMPETITION CLASSES
    3. SECTION 17C: COMPETITION RULES
    4. SECTION 17D: TECHNICAL REGULATIONS
    5. SECTION 17E: AUSTRALIAN FOUR-DAY ENDURO CHAMPIONSHIPS
  18. ATV s
    1. SECTION 18A: AUSTRALIAN CHAMPIONSHIPS
    2. SECTION 18B: COMPETITION CLASSES
    3. SECTION 18C: COMPETITION RULES
    4. SECTION 18D: TECHNICAL REGULATIONS
  19. Speedway s
    1. SECTION 19A: AUSTRALIAN CHAMPIONSHIPS
    2. SECTION 19B: AUSTRALIAN SPEEDWAY CHAMPIONSHIP
    3. SECTION 19C: AUSTRALIAN TEAM CHAMPIONSHIPS
    4. SECTION 19D: COMPETITION RULES
    5. SECTION 19E: TECHNICAL REGULATIONS
  20. Dirt Track s
    1. SECTION 20A: AUSTRALIAN CHAMPIONSHIPS
    2. SECTION 20B: COMPETITION CLASSES
    3. SECTION 20C: COMPETITION RULES
    4. SECTION 20D: TECHNICAL REGULATIONS
  21. Track s
    1. SECTION 21A: AUSTRALIAN CHAMPIONSHIPS
    2. SECTION 21B: COMPETITION CLASSES
    3. SECTION 21C: COMPETITION RULES
    4. SECTION 21D: TECHNICAL REGULATIONS
  22. Supermoto s
    1. SECTION 22A: AUSTRALIAN CHAMPIONSHIPS
    2. SECTION 22B: COMPETITION CLASSES
    3. Section 22c Competition Rules
    4. SECTION 22D: TECHNICAL REGULATIONS
  23. Trial s
    1. SECTION 23A: AUSTRALIAN CHAMPIONSHIP
    2. SECTION 23B: COMPETITION CLASSES
    3. SECTION 23C: COMPETITION RULES
    4. SECTION 23D: TECHNICAL REGULATIONS
    5. SECTION 23E: CLASS TECHNICAL REGULATIONS
  24. Minikhana s
    1. SECTION 24A: MINIKHANA CLASSES
    2. SECTION 24B: COMPETITION RULES
    3. SECTION 24C: TECHNICAL REGULATIONS
    4. SECTION 24D: MINIKHANA COURSES
  25. Policies s
    1. 25.1 Member Protection Policy
    2. 25.2 Anti-doping Policy
    3. 25.3 Anti Match-fixing Policy
    4. 25.4 Privacy Regulation
    5. 25.5 Occupational Health and Safety Policy
    6. 25.6 Environmental Sustainability Policy
    7. 25.7 National Team Selection Policy

Rules

SECTION 21D: TECHNICAL REGULATIONS


21.13 SOUND EMISSIONS

21.13.0.1 Sound testing must be carried out at all permitted events however it is not mandatory to test all machines

21.13.1 Specifications

21.13.1.1 Sound emissions are set out in the tables below:

30 meters (from side of track) ride by test

DISCIPLINE LIMIT dB(A)
Track (including Quads) 95
Record Attempts No limit
21.13.1.2 Where government regulations or planning orders exist in relation to lower sound emissions or where a venue has lower sound emission requirements as part of the hire contract, the sound emission required will prevail over GCR 21.13.1.1.

21.13.2 Sound control during competition

21.13.2.1 The Sound Control Officer (SCO) must arrive in sufficient time for discussions with the Clerk of the Course and other Technical Officials in order that a suitable test site and testing policy can be agreed.
21.13.2.2 Machines can be tested before, or after competing in an event, chosen by ballot, or as required by a Steward, Clerk of Course or SCO.

21.13.3 Use of sound level meters

21.13.3.1 Sound testing apparatus must:

  1. Comply with international standard IEC 651, Type 1 or Type 2.
  2. Include a compatible calibrator, which must be used immediately before testing begins and always just prior to a re-test if a disciplinary sanction may be imposed.
21.13.3.2 Sound testing apparatus must be set to:

  1. ‘Fast response’
  2. ‘A’ weighted,
  3. Select range High 80~130 dB,
  4. Activate the function MAX MIN – set on MAX,
21.13.3.3 ’30 Meter ride by’ test

  1. The sound levels will be measured with the sound meter/microphone fixed on a tripod, in the horizontal position, 30 meters from the edge of the track at a high speed point.
21.13.3.4 Tests shall not take place in the rain.

21.13.4 Machine testing

21.13.4.1 If a machine fails, it can be represented for re-testing.
21.13.4.2 No person may compete in any event on a machine whose noise emissions exceed the prescribed levels.
21.13.4.3 A machine which does not comply with the sound limits can be presented several times.

21.14 FUEL

21.14.1 Fuel Warning

21.14.1.1 Fuels and lubricants are highly specialised substances and participants must be aware they may contain substances that are extremely dangerous to human health if misused, inhaled or allowed to contact skin.
21.14.1.2 Some of the components of fuel and lubricants are suspected of having the potential to cause cancer in rare circumstances.
21.14.1.3 The use of petrol as a general cleaning and washing agent is a common misuse of a potentially dangerous substance.
21.14.1.4 Fuels should be used and stored with extreme care and in accordance with the manufacturer’s instructions.

21.14.2 Fuel Testing

21.14.2.1 For any event, meeting or series, the relevant controlling body may direct that no fuels other than fuels of prescribed specifications and from a prescribed source may be used.

  1. Tests to ensure that only prescribed fuels are used in an event, meeting or series may be administered at any time and place during the course of the same,
  2. The Clerk of Course, Race Director or Chief Scrutineer may direct the administration of fuel tests.
21.14.2.2 Fuel tests must comply with the following procedures:

  1. All containers for holding samples must be clean and constructed of robust non-reactive impermeable material, must be sealable, and must have provision for identification,
  2. Equipment used for the extraction of fuel from machines must be clean and constructed of fuel non-reactive material,
  3. All samples must be divided into two lots (Sample A and Sample B) of not less than 5ml each, which must be placed in separate containers,
  4. Once samples are placed in containers, the containers must immediately be sealed and identified by reference to the machine from which the sample was taken. This information must be entered on a fuel sample certificate which must certify the date, place and time of taking the sample, the identity of the machine from which the sample was taken and the identity of the rider,
  5. Both samples must remain in the control of the official who administered the test.
  6. The rider or the representative must sign the fuel sample certificate acknowledging samples have been taken and are sealed,
  7. All samples held by the official must be delivered as soon as practicable after the competition to the relevant controlling body which must deliver the Sample A as soon as practicable to a laboratory approved by MA where they must be tested for content and quality in accordance with standard scientific procedures,
  8. The relevant controlling body must as soon as practicable after receipt of the results notify the rider or rider’s team representative and MA,
  9. If the rider is dissatisfied with the test result of sample A, they may request sample B be tested at an MA approved laboratory in their presence.

21.14.3 Refuelling

21.14.3.1 During refuelling, each machine must be stationary with the engine stopped.
21.14.3.2 Refuelling will be deemed to have commenced when the fuel tank has been opened and completed when the tank is closed.
21.14.3.3 Smoking is strictly prohibited in areas where refuelling is permitted.
21.14.3.4 Riders are liable for exclusion from an event for failing to adhere to General Competition Rule 21.14.3.3, and are responsible for the actions of their mechanics and support team members.

21.14.4 Homologation of Fuel

21.14.4.1 Unleaded fuel produced by an oil company for sale in the Australian general transport fuel market through retail petrol pumps in at least five states does not have to be homologated. For the avoidance of doubt this means the fuel must be available for sale on demand from a roadside bowser outlet at each of at least five separate service stations in each of at least five Australian states or territories.
21.14.4.2 Organisations seeking homologation of fuel must provide MA with:

  1. Two one-litre sealed containers of the fuel for analysis,
  2. Details of the fuels characteristics,
  3. The distribution network,
  4. The price structure,
  5. A homologation fee of $2,500 in the first year and $2,000 per year thereafter.
21.14.4.3 Fuels approved under this General Competition Rule will be published at www.ma.org.au.

21.14.5 Fuel: Track

21.14.5.1 Fuel must be:

  1. Be unleaded, and
  2. Be no more than 100 RON; and
  3. Contain no additives other than those added at the point of manufacture except for:
    1. Lubricating oil for 2-stroke engines
    2. Upper cylinder lubricant for 4-stroke engines
  4. Be readily available from retail petrol pumps within Australia; or
  5. Be a brand of fuel homologated by MA that is compatible with the Fuel Quality Standards Act 2000.
21.14.5.2 For Senior and Classic competition, the following fuels are permitted:

  1. Commercially available pure Methanol with no additives other than lubricating oil
  2. Unleaded fuel that complies with rule 21.14.5.1.
21.14.5.3 Environmental Protection: An absorbent mat that measures 500 x 500mm minimum must be placed underneath the engine/gearbox and fuel tank of any solo or sidecar while parked in the pit, paddock or work area.

21.15 ENGINES

21.15.1 Reciprocating Engines

21.15.1.1 The formula for calculation of capacities and classes
Cubic capacity = (D2 x 3.1416 x C x N)
4
Where:D = Bore in centimetres,
C = stroke in centimetres,
N = Number of cylinders.

21.15.2 Rotary Engines

Cubic capacity = (Z x V)
N
Where:V = Capacity of each chamber comprising the engine in cubic centimetres,
N = Number of turns of the motor necessary to complete 1 cycle in a chamber, and
Z = Combustion cycles per revolution.

21.15.3 Wankel System Engines With a Triangular Piston

Cubic capacity = 2 x V x D
Where:
V = capacity of a single chamber,
D = the number of rotors.Wankel system engines are classified as 4 strokes.

21.15.4 Engine Capacity Tolerances

21.15.2.1 Unless otherwise specified in the following table, the actual engine capacity of a machine competing in a capacity class may not exceed the prescribed capacity for that class by more than 2%:

CLASS

PERMITTED EXCESS

80cc 2-stroke machines manufactured prior to 1/1/95 5%
85cc 4-stroke (Track and Dirt Track Modified) Nil
Record attempts and senior Track Nil
65cc & 85cc machines Nil

21.15.5 Superchargers and Turbochargers

21.15.3.1 Superchargers and turbochargers may only be used as follows:

  1. In drag racing or record attempts,
  2. The nominal cubic capacity of an engine as calculated under GCR 21.15.1, 21.15.2 or 21.3.3 that is fitted with a supercharger or a turbocharger shall be multiplied by two for the purposes of engine classification.

21.16 FRAMES AND PARTS

21.16.1 Streamlining

21.16.1.1 All streamlining fitted to motorcycles or sidecars must be free of any sharp edges on exposed extremities.
21.16.1.2 For fibreglass construction, edges must be rounded to their own thickness but need not be wired.
21.16.1.3 All forward streamlining attached to solo and sidecar machines must have a minimum of three attachment points:

  1. At least one supporting the forward section of the shell, and
  2. One on each side supporting the rear portion of the shell.
21.16.1.4 Identification plates must have corners and edges smoothed.

21.16.2 Fuel Tanks

21.16.2.1 Fuel tanks may be constructed from any material that has been approved by the Australian Standards Association as a petrol or fuel container material.

21.16.3 Exhaust Systems

21.16.3.1 Exhaust systems must:

  1. Be fitted with silencers,
  2. Terminate at a point not more than 25mm beyond the rear extremity of the rear tyre tread,
  3. Be attached as closely as practicable to the machine and in a manner that does not, in the opinion of the Scrutineer, create a hazard to other competitors,
  4. Where separate silencers are fitted, have a minimum of two mountings or locking screws on all machines which have a capacity in excess of 85cc,
  5. Where silencers are re-packable, have safety wired securing bolts.

21.16.4 Centre and Side Stands

21.16.4.1 Centre and side stands must be removed for all types of competition other than the 50cc class.
21.16.4.2 Centre and Side Stands which remain on machines under the previous GCR must be secured in the closed position.

21.16.5 Footrests

21.16.5.1 Footrests must:

  1. Be well rounded and designed so as to ensure that no dangerous edges are created due to wear.
  2. Not touch the ground at lean unless they are hinged or pivoted and controlled by a return spring.

21.16.6 Handlebars

21.16.6.1 The ends of the handlebars or twist grip sleeves must be securely plugged so as to present a flush or rounded end.
21.16.6.2 Handlebar levers must:

  1. Have ball ends with a minimum diameter of:
    1. 15mm, for levers longer than 76mm,
    2. 10mm, for levers shorter than 76mm.
  2. Measure no more than 200mm from the fulcrum to the extremity of the ball.
21.16.6.3 Throttle controls must be self-closing.
21.16.6.4 A lanyard operated ignition cut-out switch, operating on the primary circuit, must be fitted to Track sidecars.

21.16.7 Kick Start Levers

21.16.7.1 Kick start levers, other than transverse, must be folding.

21.16.8 Drive Chain Protection

21.16.8.1 Primary drives (the drive connecting engine to clutch) must be guarded so as to prevent direct access to the chain or sprockets with the fingers.
21.16.8.2 The guard must be constructed of:

  1. Metal having a minimum thickness of 1.6mm, which may be mesh or expanded metal provided the openings do not exceed 10mm, or
  2. Fibreglass having a minimum thickness of 3mm.
21.16.8.3 If a plastic, fibreglass or part open chain guard is used, a steel bolt of not less than 10mm diameter, placed outside the bottom rear quadrant of the clutch sprocket. This bolt, if damaged, must be replaced.
21.16.8.4 Projecting sprockets, which are not behind a clutch assembly or directly behind a frame member, must be guarded where the sprocket teeth are further than 30mm from a frame member or swinging arm.
21.16.8.5 A counter shaft sprocket which is more than 30mm from the outside of the swing arm pivot must be covered.
21.16.8.6 A chain guard made of suitable material must be fitted in a way to prevent trapping between the lower drive chain run and the final drive sprocket at the rear wheel.

21.16.9 Tyres

21.16.9.1 Tyres must comply with the following:

  1. Metal studs, spikes, chain, rope or other non-skid attachments may not be used unless permitted by the relevant supplementary regulations.
  2. Treads on tyres must be at least 1mm deep on any part of the tyre that comes in contact with the ground.
  3. The tread depth indicating holes on slick tyres must be clearly visible and at least 0.5mm deep.
  4. Paddle or scoop treaded tyres may not be fitted.
21.16.9.2 Valve caps must be used for all competitions.

21.16.10 Mudguards

21.16.10.1 Either a rear mudguard or a seat must be fitted which extends at least 20 degrees to the rear of a vertical line drawn through the rear wheel axle.
21.16.10.2 Mudguards must be made of a material, which is not liable to cause personal injury if deformed.

21.16.11 Senior Solo

21.16.11.1 Brakes must not be fitted to track slider type machines of 500cc. All other solo classes must be fitted with at least one effective brake.
21.16.11.2 Rear suspension and swingarm must be fitted.
21.16.11.3 Must have a minimum of two gears.
21.16.11.4 Minimum weight of 85 kg.
21.16.11.5 For long track only, the rear wheel rim must have a maximum width of 100 mm, be 19″ or 22″ in diameter, as defined in the supplementary regulations.
21.16.11.6 If hand protectors are used, they must be of a shatterproof material.

21.16.12 Sidecar: General

21.16.12.1 Left hand and right hand sidecars may not compete against each other.
21.16.12.2 Sidecars, in addition to complying with the requirements for solos, must be as follows:

  1. The sidecar body width must be 890mm measured from the closest mounting point to the extremity of the sidecar body including any step,
  2. The inside of the sidecar wheel must be enclosed to floor level,
  3. Any step must have a maximum width of 200mm from the sidecar,
  4. Front mounted exhaust systems must not protrude beyond the outermost edges of the sidecar,
  5. All outer edge sidecar chassis corners must have a minimum 25mm radius,
  6. Sidecar wheel drive is prohibited.

21.16.13 Sidecar: Track

21.16.13.1 The wheel track must be between 635mm and 1000mm measured between the longitudinal centres of the rear and sidecar wheels.
21.16.13.2 The ground clearance must be at least 75mm unladen.
21.16.13.3 The stagger at the top of the sidecar wheel must be:

  1. Inwards, no more than 300mm.
  2. Outwards, nil.
21.16.13.4 The dimensions of the sidecar baseboard in plan view, taken from a line drawn no further rearwards than the lowest point of the front down tubes to the forward-most point of the sidecar wheel tyre and terminating no further rearwards than a line drawn at right angles to the machine from the rearmost point of the rear tyre, must be:

  1. At least 760mm long adjacent to the sidecar wheel,
  2. At least 300mm wide, having at least 25mm radius to all corners.
21.16.13.5 All edges of the sidecar floor, not otherwise protected, must be protected by a nose cone or a rail of at least 50mm height.
21.16.13.6 There must be no more than 50mm between the baseboard and motorcycle and the baseboard and sidecar wheel. The baseboard must be arranged so as not to allow the passenger’s feet to be trapped.
21.16.13.7 The drive must be transmitted to the track through the rear wheel of the motorcycle.
21.16.13.8 Safety chains must be fitted to all machines equipped with girder type front forks.
21.16.13.9 A passenger must be carried in a suitably constructed sidecar.
21.16.13.10 The sidecar must be attached to the left hand side of the motorcycle.
21.16.13.11 There must be no less than four sidecar mounting points.
21.16.13.12 Stirrup fittings for the passenger’s feet are not permitted.
21.16.13.13 Handholds:

  1. Must be finished with a loop of at least 100mm,
  2. Must not project beyond a line taken with the outer edge of the sidecar mudguard or bodywork,
  3. Adjacent to the nose section of the sidecar and less than 200mm from the track surface must be at a minimum angle of 45° from the horizontal.
21.16.13.14 A suitable passenger handhold must be provided on the off-side of the rear wheel.
21.16.13.15 The rear end of the rear wheel mudguard must terminate not more than 45° above a horizontal line drawn through the rear wheel axle and be valanced to baseboard level on the inside and to axle level on the outside, with the suspension depressed.
21.16.13.16 The sidecar mudguard, if fitted, must cover at least 180° of the periphery of the wheel and be valanced to baseboard level on both sides.
21.16.13.17 A sidecar wheel disc may be fitted instead of a sidecar mudguard.
21.16.13.18 The rear wheel sprocket must have an approved guard, being either:

  1. A fully enclosed steel chain guard, or
  2. If a plastic or part open chain guard is used, a steel bolt of not less than 10mm minimum diameter placed outside the bottom rear quadrant of the clutch sprocket. This bolt, if damaged, must be replaced.
21.16.13.19 Where Harley-type forks are used, an approved bolt must be fitted to lock the triple clamp.
21.16.13.20 There must be a kill switch which must:

  1. Cut out the ignition,
  2. Operate on the primary circuit,
  3. Be fitted with a lanyard which must:
    1. Have a total extended length not exceeding 500mm,
    2. Be attached around the rider’s right wrist when the machine is in motion,
    3. Not be secured to the handlebar unless by a readily torn material.
21.16.13.21 Sidecar engines: For a machine competing in any event, the engine must comply as follows:

  1. The engine capacity must not exceed 1100cc,
  2. Supercharged and turbocharged engines must not exceed 500cc,
  3. On liquid-cooled engines, an overflow pipe must be used to direct any overflow of coolant away from the rider and passenger.

21.17 TECHNICAL REGULATIONS: CLASSIC TRACK

21.17.1 Classic Track Eligibility

21.17.1.1 Engines must have been manufactured before 31st December 1976.
21.17.1.2 Competitors must be aged at least 30 years at the date of the competition.

21.17.2 Classic Track Frames and Parts

21.17.2.1 The frame:

  1. Must have conventional swingarm rear suspension with twin shock absorbers,
  2. Must have a front wheel diameter of 23″ (594mm),
  3. Must have a rear wheel diameter of 19″ (482mm) or 22″ (560mm), as specified in the supplementary regulations,
  4. Must have rear tyres with a maximum tread pattern depth of 8mm,
  5. Must not be fitted with leading-link front forks.

21.17.3 Classic Track Engine Specifications

21.17.3.1 The engine must be:

  1. Single cylinder,
  2. Two valve, push rod operated,
  3. Single spark plug,
  4. Of a maximum capacity of 500cc with a 2% tolerance,
  5. Vertical in the chassis,
  6. Fitted with a round slide carburettor of 38mm maximum bore,
  7. Must not be fitted with a centre port cross flow cylinder head.

21.17.4 Classic Track Gearbox

21.17.4.1 The gearbox must have at least two gears.

21.18 TECHNICAL REGULATIONS: JUNIOR TRACK

21.18.1 50cc Demo Class Machines

21.18.1.1 Eligible Machines are:

MANUFACTURER

MODEL(s)

FMC PY50, XRX50EY
Honda CRF50, QR50
HM Baja Junior
Husqvarna Husky Boy Junior
Kawasaki KDX50
Kazuma Tiger Cat 50
KTM Mini Adventure, 50ADV Senior, 50SX Mini, 50SX Junior 2008, 50SX Mini 2009
LEM LX1, CX2, LXR50, RX2-AIR, RX2
Suzuki JR50
TM 50C1
Yamaha PW50, TT-R50E

and similarly specified machines as approved by the Board may be used.

21.18.1.2 Technical requirements: 50cc Demo
21.18.1.1 Machine Requirements:

  1. Engine capacity must not exceed 50cc,
  2. The gearbox for 2-stroke machines must have 1 gear,
  3. The gearbox for 4-stroke machines may have up to 3 gears,
  4. Standard gear ratios must be retained,
  5. The clutch must be of centrifugal type, and of OEM type,
  6. 10″ [254mm] wheels must be fitted, Wheels as per GCR 21.18.3 must be fitted.
  7. The appearance of a machine must remain as manufactured provided that the following may be altered All machines must remain standard to the OEM specifications for the model. Only the following items may be modified:
    1. Colour,
    2. Seat,
    3. Mudguards,
    4. Handlebars,
    5. Grips,
    6. Levers,
    7. Cables,
    8. Chains,
    9. Tyre brand and tread pattern,
    10. Carburettor jets,
    11. Spark plug.
  8. The frame of a machine may be gusseted and strengthened but not so as to alter the geometry of the frame. A certificate issued by a qualified engineer in respect of any such gusseting and strengthening must be available at machine examination,
  9. The restricting washer in the exhaust header pipe abutting the cylinder barrel may be removed,
  10. Throttle limiting devices may be removed,
  11. A separate kill switch may be installed in place of the standard,
  12. Steel serrated foot pegs may replace standard rubber pegs,
  13. Handlebars must be securely plugged and be no wider than 630mm,
  14. Engine, carburettor, fuel system, exhaust system, electrics & air box must remain as per manufacturers specifications,
  15. Carburettor size must not exceed 14mm.

21.18.2 50cc Auto Class Machines

21.18.2.1 Eligible Machines are:

MANUFACTURER

MODEL(s)

Cobra King CX50
Gas Gas EC 50
HM CRX 10/10 Senior, Baja 10/10, X3R
Husqvarna Husky Boy SF03, CR50
Italjet Action Outlaw
KTM SXR PRO SNR, 50SX, SXR PRO JNR, 50 SX 2009
LEM RX3, RX3 2008, LX2F-USA, CR2, CR2S
Malagutti RCX10
Polini XR3
TM 50 C1
Metrakit MKX50

and similarly specified machines as approved by the Board may be used.

21.18.2.2 Machine Requirements:

  1. Engine capacity must not exceed 50cc,
  2. The gearbox must have one gear,
  3. External gearing may be altered,
  4. The clutch must be of centrifugal type, and of OEM type,
  5. Wheels as per GCR 21.18.3 must be fitted,
  6. The appearance of a machine must remain as manufactured provided that the following may be altered All machines must remain standard to the OEM specifications for the model. Only the following items may be modified:
    1. Colour,
    2. Seat,
    3. Mudguards,
    4. Handlebars,
    5. Grips,
    6. Levers,
    7. Cables,
    8. Chains,
    9. Tyre brand and tread pattern,
    10. Carburettor jets.
  7. The frame of a machine may be gusseted and strengthened but not so as to alter the geometry of the frame. A certificate issued by a qualified engineer in respect of any such gusseting and strengthening must be available at machine examination,
  8. Throttle limiting devices may be removed,
  9. A separate kill switch may be installed in place of the standard,
  10. Steel serrated foot pegs may replace standard rubber pegs,
  11. Handlebars must be fitted as per GCR 21.18.5, securely plugged and be no wider than 630mm,
  12. After-market exhaust systems and silencers are permitted.
21.18.2.3 85cc 4-stroke modified. OEM Frame, 2 valve cylinder head, standard gearbox and number of gears to be retained.

21.18.3 Junior Solo: Wheel Sizes

CLASS

FRONT [Approx. Metric Equiv. in mm]

REAR [Approx. Metric Equiv.in mm]

50cc Demo Class 10″ [254] 10″ [254]
50cc Auto/Demo Class 10″ or 12″ [254 or 305] 10″ [254]
65cc 14″ to 15″ [356 to 381] 12″ [305]
80cc 4-stroke Standard & Modified 16″ to 17″ [407 to 432] 14″ [356]
85cc 2-stroke & 150cc 4-stroke 15″ to 17″ [381 to 432] 14″ [356]
85cc 2-stroke & 150cc 4-stroke Big Wheel 19″ to 21″ [482 to 534] 16″ to 19″ [407 to 482]
85cc 2-stroke & 150cc 4-stroke Big Wheel (Dirt Track & Track) 19″ [482] 16″ or 17″ [407 to 457]
85cc 2-stroke & 150cc 4-stroke Standard Wheel (Dirt Track & Track) 17″ [457] 14″ [356]
100cc 18″ to 21″ [457 to 534] 16″ to 19″ [407 to 482]
125cc & over 17″ to 21″ [432 to 534] 16″ to 19″ [407 to 482]
250cc 4-stroke 17″ to 23″ [432 to 586] 16″ to 19″ [407 to 482]

21.18.4 Junior Sidecar: Wheel Sizes

21.18.4.1 The maximum wheel rim sizes for all relevant classes are:

WHEEL

SIZE [Approx. Metric Equivalent]

Front 19″ [482mm]
Rear 16″ [407mm]
Sidecar 14″ [356mm]

21.18.5 Junior Solo: Handlebars

21.18.5.1 Solo handlebars must be securely plugged. and have no greater than the following widths: The width of handlebars must be not less than 600mm and not more than 850mm.

CAPACITY

HANDLEBAR WIDTH

50cc Automatic 630mm or OEM for the model
65cc 750mm
85cc 2 stroke / 150cc 4 stroke 800mm
Over 85cc / 150cc 4 stroke 850mm

21.18.6 Junior Tyres

21.18.6.1 Motocross knobby tyres on the rear of any machine over 85cc 2-stroke and 150cc 4-stroke are prohibited.

SECTION 21D: TECHNICAL REGULATIONS


21.13 SOUND EMISSIONS

21.13.0.1 Sound testing must be carried out at all permitted events however it is not mandatory to test all machines

21.13.1 Specifications

21.13.1.1 Sound emissions are set out in the tables below:

30 meters (from side of track) ride by test

DISCIPLINE LIMIT dB(A)
Track (including Quads) 95
Record Attempts No limit
21.13.1.2 Where government regulations or planning orders exist in relation to lower sound emissions or where a venue has lower sound emission requirements as part of the hire contract, the sound emission required will prevail over GCR 21.13.1.1.

21.13.2 Sound control during competition

21.13.2.1 The Sound Control Officer (SCO) must arrive in sufficient time for discussions with the Clerk of the Course and other Technical Officials in order that a suitable test site and testing policy can be agreed.
21.13.2.2 Machines can be tested before, or after competing in an event, chosen by ballot, or as required by a Steward, Clerk of Course or SCO.

21.13.3 Use of sound level meters

21.13.3.1 Sound testing apparatus must:

  1. Comply with international standard IEC 651, Type 1 or Type 2.
  2. Include a compatible calibrator, which must be used immediately before testing begins and always just prior to a re-test if a disciplinary sanction may be imposed.
21.13.3.2 Sound testing apparatus must be set to:

  1. ‘Fast response’
  2. ‘A’ weighted,
  3. Select range High 80~130 dB,
  4. Activate the function MAX MIN – set on MAX,
21.13.3.3 ’30 Meter ride by’ test

  1. The sound levels will be measured with the sound meter/microphone fixed on a tripod, in the horizontal position, 30 meters from the edge of the track at a high speed point.
21.13.3.4 Tests shall not take place in the rain.

21.13.4 Machine testing

21.13.4.1 If a machine fails, it can be represented for re-testing.
21.13.4.2 No person may compete in any event on a machine whose noise emissions exceed the prescribed levels.
21.13.4.3 A machine which does not comply with the sound limits can be presented several times.

21.14 FUEL

21.14.1 Fuel Warning

21.14.1.1 Fuels and lubricants are highly specialised substances and participants must be aware they may contain substances that are extremely dangerous to human health if misused, inhaled or allowed to contact skin.
21.14.1.2 Some of the components of fuel and lubricants are suspected of having the potential to cause cancer in rare circumstances.
21.14.1.3 The use of petrol as a general cleaning and washing agent is a common misuse of a potentially dangerous substance.
21.14.1.4 Fuels should be used and stored with extreme care and in accordance with the manufacturer’s instructions.

21.14.2 Fuel Testing

21.14.2.1 For any event, meeting or series, the relevant controlling body may direct that no fuels other than fuels of prescribed specifications and from a prescribed source may be used.

  1. Tests to ensure that only prescribed fuels are used in an event, meeting or series may be administered at any time and place during the course of the same,
  2. The Clerk of Course, Race Director or Chief Scrutineer may direct the administration of fuel tests.
21.14.2.2 Fuel tests must comply with the following procedures:

  1. All containers for holding samples must be clean and constructed of robust non-reactive impermeable material, must be sealable, and must have provision for identification,
  2. Equipment used for the extraction of fuel from machines must be clean and constructed of fuel non-reactive material,
  3. All samples must be divided into two lots (Sample A and Sample B) of not less than 5ml each, which must be placed in separate containers,
  4. Once samples are placed in containers, the containers must immediately be sealed and identified by reference to the machine from which the sample was taken. This information must be entered on a fuel sample certificate which must certify the date, place and time of taking the sample, the identity of the machine from which the sample was taken and the identity of the rider,
  5. Both samples must remain in the control of the official who administered the test.
  6. The rider or the representative must sign the fuel sample certificate acknowledging samples have been taken and are sealed,
  7. All samples held by the official must be delivered as soon as practicable after the competition to the relevant controlling body which must deliver the Sample A as soon as practicable to a laboratory approved by MA where they must be tested for content and quality in accordance with standard scientific procedures,
  8. The relevant controlling body must as soon as practicable after receipt of the results notify the rider or rider’s team representative and MA,
  9. If the rider is dissatisfied with the test result of sample A, they may request sample B be tested at an MA approved laboratory in their presence.

21.14.3 Refuelling

21.14.3.1 During refuelling, each machine must be stationary with the engine stopped.
21.14.3.2 Refuelling will be deemed to have commenced when the fuel tank has been opened and completed when the tank is closed.
21.14.3.3 Smoking is strictly prohibited in areas where refuelling is permitted.
21.14.3.4 Riders are liable for exclusion from an event for failing to adhere to General Competition Rule 21.14.3.3, and are responsible for the actions of their mechanics and support team members.

21.14.4 Homologation of Fuel

21.14.4.1 Unleaded fuel produced by an oil company for sale in the Australian general transport fuel market through retail petrol pumps in at least five states does not have to be homologated. For the avoidance of doubt this means the fuel must be available for sale on demand from a roadside bowser outlet at each of at least five separate service stations in each of at least five Australian states or territories.
21.14.4.2 Organisations seeking homologation of fuel must provide MA with:

  1. Two one-litre sealed containers of the fuel for analysis,
  2. Details of the fuels characteristics,
  3. The distribution network,
  4. The price structure,
  5. A homologation fee of $2,500 in the first year and $2,000 per year thereafter.
21.14.4.3 Fuels approved under this General Competition Rule will be published at www.ma.org.au.

21.14.5 Fuel: Track

21.14.5.1 Fuel must be:

  1. Be unleaded, and
  2. Be no more than 100 RON; and
  3. Contain no additives other than those added at the point of manufacture except for:
    1. Lubricating oil for 2-stroke engines
    2. Upper cylinder lubricant for 4-stroke engines
  4. Be readily available from retail petrol pumps within Australia; or
  5. Be a brand of fuel homologated by MA that is compatible with the Fuel Quality Standards Act 2000.
21.14.5.2 For Senior and Classic competition, the following fuels are permitted:

  1. Commercially available pure Methanol with no additives other than lubricating oil
  2. Unleaded fuel that complies with rule 21.14.5.1.
21.14.5.3 Environmental Protection: An absorbent mat that measures 500 x 500mm minimum must be placed underneath the engine/gearbox and fuel tank of any solo or sidecar while parked in the pit, paddock or work area.

21.15 ENGINES

21.15.1 Reciprocating Engines

21.15.1.1 The formula for calculation of capacities and classes
Cubic capacity = (D2 x 3.1416 x C x N)
4
Where:D = Bore in centimetres,
C = stroke in centimetres,
N = Number of cylinders.

21.15.2 Rotary Engines

Cubic capacity = (Z x V)
N
Where:V = Capacity of each chamber comprising the engine in cubic centimetres,
N = Number of turns of the motor necessary to complete 1 cycle in a chamber, and
Z = Combustion cycles per revolution.

21.15.3 Wankel System Engines With a Triangular Piston

Cubic capacity = 2 x V x D
Where:
V = capacity of a single chamber,
D = the number of rotors.Wankel system engines are classified as 4 strokes.

21.15.4 Engine Capacity Tolerances

21.15.2.1 Unless otherwise specified in the following table, the actual engine capacity of a machine competing in a capacity class may not exceed the prescribed capacity for that class by more than 2%:

CLASS

PERMITTED EXCESS

80cc 2-stroke machines manufactured prior to 1/1/95 5%
85cc 4-stroke (Track and Dirt Track Modified) Nil
Record attempts and senior Track Nil
65cc & 85cc machines Nil

21.15.5 Superchargers and Turbochargers

21.15.3.1 Superchargers and turbochargers may only be used as follows:

  1. In drag racing or record attempts,
  2. The nominal cubic capacity of an engine as calculated under GCR 21.15.1, 21.15.2 or 21.3.3 that is fitted with a supercharger or a turbocharger shall be multiplied by two for the purposes of engine classification.

21.16 FRAMES AND PARTS

21.16.1 Streamlining

21.16.1.1 All streamlining fitted to motorcycles or sidecars must be free of any sharp edges on exposed extremities.
21.16.1.2 For fibreglass construction, edges must be rounded to their own thickness but need not be wired.
21.16.1.3 All forward streamlining attached to solo and sidecar machines must have a minimum of three attachment points:

  1. At least one supporting the forward section of the shell, and
  2. One on each side supporting the rear portion of the shell.
21.16.1.4 Identification plates must have corners and edges smoothed.

21.16.2 Fuel Tanks

21.16.2.1 Fuel tanks may be constructed from any material that has been approved by the Australian Standards Association as a petrol or fuel container material.

21.16.3 Exhaust Systems

21.16.3.1 Exhaust systems must:

  1. Be fitted with silencers,
  2. Terminate at a point not more than 25mm beyond the rear extremity of the rear tyre tread,
  3. Be attached as closely as practicable to the machine and in a manner that does not, in the opinion of the Scrutineer, create a hazard to other competitors,
  4. Where separate silencers are fitted, have a minimum of two mountings or locking screws on all machines which have a capacity in excess of 85cc,
  5. Where silencers are re-packable, have safety wired securing bolts.

21.16.4 Centre and Side Stands

21.16.4.1 Centre and side stands must be removed for all types of competition other than the 50cc class.
21.16.4.2 Centre and Side Stands which remain on machines under the previous GCR must be secured in the closed position.

21.16.5 Footrests

21.16.5.1 Footrests must:

  1. Be well rounded and designed so as to ensure that no dangerous edges are created due to wear.
  2. Not touch the ground at lean unless they are hinged or pivoted and controlled by a return spring.

21.16.6 Handlebars

21.16.6.1 The ends of the handlebars or twist grip sleeves must be securely plugged so as to present a flush or rounded end.
21.16.6.2 Handlebar levers must:

  1. Have ball ends with a minimum diameter of:
    1. 15mm, for levers longer than 76mm,
    2. 10mm, for levers shorter than 76mm.
  2. Measure no more than 200mm from the fulcrum to the extremity of the ball.
21.16.6.3 Throttle controls must be self-closing.
21.16.6.4 A lanyard operated ignition cut-out switch, operating on the primary circuit, must be fitted to Track sidecars.

21.16.7 Kick Start Levers

21.16.7.1 Kick start levers, other than transverse, must be folding.

21.16.8 Drive Chain Protection

21.16.8.1 Primary drives (the drive connecting engine to clutch) must be guarded so as to prevent direct access to the chain or sprockets with the fingers.
21.16.8.2 The guard must be constructed of:

  1. Metal having a minimum thickness of 1.6mm, which may be mesh or expanded metal provided the openings do not exceed 10mm, or
  2. Fibreglass having a minimum thickness of 3mm.
21.16.8.3 If a plastic, fibreglass or part open chain guard is used, a steel bolt of not less than 10mm diameter, placed outside the bottom rear quadrant of the clutch sprocket. This bolt, if damaged, must be replaced.
21.16.8.4 Projecting sprockets, which are not behind a clutch assembly or directly behind a frame member, must be guarded where the sprocket teeth are further than 30mm from a frame member or swinging arm.
21.16.8.5 A counter shaft sprocket which is more than 30mm from the outside of the swing arm pivot must be covered.
21.16.8.6 A chain guard made of suitable material must be fitted in a way to prevent trapping between the lower drive chain run and the final drive sprocket at the rear wheel.

21.16.9 Tyres

21.16.9.1 Tyres must comply with the following:

  1. Metal studs, spikes, chain, rope or other non-skid attachments may not be used unless permitted by the relevant supplementary regulations.
  2. Treads on tyres must be at least 1mm deep on any part of the tyre that comes in contact with the ground.
  3. The tread depth indicating holes on slick tyres must be clearly visible and at least 0.5mm deep.
  4. Paddle or scoop treaded tyres may not be fitted.
21.16.9.2 Valve caps must be used for all competitions.

21.16.10 Mudguards

21.16.10.1 Either a rear mudguard or a seat must be fitted which extends at least 20 degrees to the rear of a vertical line drawn through the rear wheel axle.
21.16.10.2 Mudguards must be made of a material, which is not liable to cause personal injury if deformed.

21.16.11 Senior Solo

21.16.11.1 Brakes must not be fitted to track slider type machines of 500cc. All other solo classes must be fitted with at least one effective brake.
21.16.11.2 Rear suspension and swingarm must be fitted.
21.16.11.3 Must have a minimum of two gears.
21.16.11.4 Minimum weight of 85 kg.
21.16.11.5 For long track only, the rear wheel rim must have a maximum width of 100 mm, be 19″ or 22″ in diameter, as defined in the supplementary regulations.
21.16.11.6 If hand protectors are used, they must be of a shatterproof material.

21.16.12 Sidecar: General

21.16.12.1 Left hand and right hand sidecars may not compete against each other.
21.16.12.2 Sidecars, in addition to complying with the requirements for solos, must be as follows:

  1. The sidecar body width must be 890mm measured from the closest mounting point to the extremity of the sidecar body including any step,
  2. The inside of the sidecar wheel must be enclosed to floor level,
  3. Any step must have a maximum width of 200mm from the sidecar,
  4. Front mounted exhaust systems must not protrude beyond the outermost edges of the sidecar,
  5. All outer edge sidecar chassis corners must have a minimum 25mm radius,
  6. Sidecar wheel drive is prohibited.

21.16.13 Sidecar: Track

21.16.13.1 The wheel track must be between 635mm and 1000mm measured between the longitudinal centres of the rear and sidecar wheels.
21.16.13.2 The ground clearance must be at least 75mm unladen.
21.16.13.3 The stagger at the top of the sidecar wheel must be:

  1. Inwards, no more than 300mm.
  2. Outwards, nil.
21.16.13.4 The dimensions of the sidecar baseboard in plan view, taken from a line drawn no further rearwards than the lowest point of the front down tubes to the forward-most point of the sidecar wheel tyre and terminating no further rearwards than a line drawn at right angles to the machine from the rearmost point of the rear tyre, must be:

  1. At least 760mm long adjacent to the sidecar wheel,
  2. At least 300mm wide, having at least 25mm radius to all corners.
21.16.13.5 All edges of the sidecar floor, not otherwise protected, must be protected by a nose cone or a rail of at least 50mm height.
21.16.13.6 There must be no more than 50mm between the baseboard and motorcycle and the baseboard and sidecar wheel. The baseboard must be arranged so as not to allow the passenger’s feet to be trapped.
21.16.13.7 The drive must be transmitted to the track through the rear wheel of the motorcycle.
21.16.13.8 Safety chains must be fitted to all machines equipped with girder type front forks.
21.16.13.9 A passenger must be carried in a suitably constructed sidecar.
21.16.13.10 The sidecar must be attached to the left hand side of the motorcycle.
21.16.13.11 There must be no less than four sidecar mounting points.
21.16.13.12 Stirrup fittings for the passenger’s feet are not permitted.
21.16.13.13 Handholds:

  1. Must be finished with a loop of at least 100mm,
  2. Must not project beyond a line taken with the outer edge of the sidecar mudguard or bodywork,
  3. Adjacent to the nose section of the sidecar and less than 200mm from the track surface must be at a minimum angle of 45° from the horizontal.
21.16.13.14 A suitable passenger handhold must be provided on the off-side of the rear wheel.
21.16.13.15 The rear end of the rear wheel mudguard must terminate not more than 45° above a horizontal line drawn through the rear wheel axle and be valanced to baseboard level on the inside and to axle level on the outside, with the suspension depressed.
21.16.13.16 The sidecar mudguard, if fitted, must cover at least 180° of the periphery of the wheel and be valanced to baseboard level on both sides.
21.16.13.17 A sidecar wheel disc may be fitted instead of a sidecar mudguard.
21.16.13.18 The rear wheel sprocket must have an approved guard, being either:

  1. A fully enclosed steel chain guard, or
  2. If a plastic or part open chain guard is used, a steel bolt of not less than 10mm minimum diameter placed outside the bottom rear quadrant of the clutch sprocket. This bolt, if damaged, must be replaced.
21.16.13.19 Where Harley-type forks are used, an approved bolt must be fitted to lock the triple clamp.
21.16.13.20 There must be a kill switch which must:

  1. Cut out the ignition,
  2. Operate on the primary circuit,
  3. Be fitted with a lanyard which must:
    1. Have a total extended length not exceeding 500mm,
    2. Be attached around the rider’s right wrist when the machine is in motion,
    3. Not be secured to the handlebar unless by a readily torn material.
21.16.13.21 Sidecar engines: For a machine competing in any event, the engine must comply as follows:

  1. The engine capacity must not exceed 1100cc,
  2. Supercharged and turbocharged engines must not exceed 500cc,
  3. On liquid-cooled engines, an overflow pipe must be used to direct any overflow of coolant away from the rider and passenger.

21.17 TECHNICAL REGULATIONS: CLASSIC TRACK

21.17.1 Classic Track Eligibility

21.17.1.1 Engines must have been manufactured before 31st December 1976.
21.17.1.2 Competitors must be aged at least 30 years at the date of the competition.

21.17.2 Classic Track Frames and Parts

21.17.2.1 The frame:

  1. Must have conventional swingarm rear suspension with twin shock absorbers,
  2. Must have a front wheel diameter of 23″ (594mm),
  3. Must have a rear wheel diameter of 19″ (482mm) or 22″ (560mm), as specified in the supplementary regulations,
  4. Must have rear tyres with a maximum tread pattern depth of 8mm,
  5. Must not be fitted with leading-link front forks.

21.17.3 Classic Track Engine Specifications

21.17.3.1 The engine must be:

  1. Single cylinder,
  2. Two valve, push rod operated,
  3. Single spark plug,
  4. Of a maximum capacity of 500cc with a 2% tolerance,
  5. Vertical in the chassis,
  6. Fitted with a round slide carburettor of 38mm maximum bore,
  7. Must not be fitted with a centre port cross flow cylinder head.

21.17.4 Classic Track Gearbox

21.17.4.1 The gearbox must have at least two gears.

21.18 TECHNICAL REGULATIONS: JUNIOR TRACK

21.18.1 50cc Demo Class Machines

21.18.1.1 Eligible Machines are:

MANUFACTURER

MODEL(s)

FMC PY50, XRX50EY
Honda CRF50, QR50
HM Baja Junior
Husqvarna Husky Boy Junior
Kawasaki KDX50
Kazuma Tiger Cat 50
KTM Mini Adventure, 50ADV Senior, 50SX Mini, 50SX Junior 2008, 50SX Mini 2009
LEM LX1, CX2, LXR50, RX2-AIR, RX2
Suzuki JR50
TM 50C1
Yamaha PW50, TT-R50E

and similarly specified machines as approved by the Board may be used.

21.18.1.2 Technical requirements: 50cc Demo
21.18.1.1 Machine Requirements:

  1. Engine capacity must not exceed 50cc,
  2. The gearbox for 2-stroke machines must have 1 gear,
  3. The gearbox for 4-stroke machines may have up to 3 gears,
  4. Standard gear ratios must be retained,
  5. The clutch must be of centrifugal type, and of OEM type,
  6. 10″ [254mm] wheels must be fitted, Wheels as per GCR 21.18.3 must be fitted.
  7. The appearance of a machine must remain as manufactured provided that the following may be altered All machines must remain standard to the OEM specifications for the model. Only the following items may be modified:
    1. Colour,
    2. Seat,
    3. Mudguards,
    4. Handlebars,
    5. Grips,
    6. Levers,
    7. Cables,
    8. Chains,
    9. Tyre brand and tread pattern,
    10. Carburettor jets,
    11. Spark plug.
  8. The frame of a machine may be gusseted and strengthened but not so as to alter the geometry of the frame. A certificate issued by a qualified engineer in respect of any such gusseting and strengthening must be available at machine examination,
  9. The restricting washer in the exhaust header pipe abutting the cylinder barrel may be removed,
  10. Throttle limiting devices may be removed,
  11. A separate kill switch may be installed in place of the standard,
  12. Steel serrated foot pegs may replace standard rubber pegs,
  13. Handlebars must be securely plugged and be no wider than 630mm,
  14. Engine, carburettor, fuel system, exhaust system, electrics & air box must remain as per manufacturers specifications,
  15. Carburettor size must not exceed 14mm.

21.18.2 50cc Auto Class Machines

21.18.2.1 Eligible Machines are:

MANUFACTURER

MODEL(s)

Cobra King CX50
Gas Gas EC 50
HM CRX 10/10 Senior, Baja 10/10, X3R
Husqvarna Husky Boy SF03, CR50
Italjet Action Outlaw
KTM SXR PRO SNR, 50SX, SXR PRO JNR, 50 SX 2009
LEM RX3, RX3 2008, LX2F-USA, CR2, CR2S
Malagutti RCX10
Polini XR3
TM 50 C1
Metrakit MKX50

and similarly specified machines as approved by the Board may be used.

21.18.2.2 Machine Requirements:

  1. Engine capacity must not exceed 50cc,
  2. The gearbox must have one gear,
  3. External gearing may be altered,
  4. The clutch must be of centrifugal type, and of OEM type,
  5. Wheels as per GCR 21.18.3 must be fitted,
  6. The appearance of a machine must remain as manufactured provided that the following may be altered All machines must remain standard to the OEM specifications for the model. Only the following items may be modified:
    1. Colour,
    2. Seat,
    3. Mudguards,
    4. Handlebars,
    5. Grips,
    6. Levers,
    7. Cables,
    8. Chains,
    9. Tyre brand and tread pattern,
    10. Carburettor jets.
  7. The frame of a machine may be gusseted and strengthened but not so as to alter the geometry of the frame. A certificate issued by a qualified engineer in respect of any such gusseting and strengthening must be available at machine examination,
  8. Throttle limiting devices may be removed,
  9. A separate kill switch may be installed in place of the standard,
  10. Steel serrated foot pegs may replace standard rubber pegs,
  11. Handlebars must be fitted as per GCR 21.18.5, securely plugged and be no wider than 630mm,
  12. After-market exhaust systems and silencers are permitted.
21.18.2.3 85cc 4-stroke modified. OEM Frame, 2 valve cylinder head, standard gearbox and number of gears to be retained.

21.18.3 Junior Solo: Wheel Sizes

CLASS

FRONT [Approx. Metric Equiv. in mm]

REAR [Approx. Metric Equiv.in mm]

50cc Demo Class 10″ [254] 10″ [254]
50cc Auto/Demo Class 10″ or 12″ [254 or 305] 10″ [254]
65cc 14″ to 15″ [356 to 381] 12″ [305]
80cc 4-stroke Standard & Modified 16″ to 17″ [407 to 432] 14″ [356]
85cc 2-stroke & 150cc 4-stroke 15″ to 17″ [381 to 432] 14″ [356]
85cc 2-stroke & 150cc 4-stroke Big Wheel 19″ to 21″ [482 to 534] 16″ to 19″ [407 to 482]
85cc 2-stroke & 150cc 4-stroke Big Wheel (Dirt Track & Track) 19″ [482] 16″ or 17″ [407 to 457]
85cc 2-stroke & 150cc 4-stroke Standard Wheel (Dirt Track & Track) 17″ [457] 14″ [356]
100cc 18″ to 21″ [457 to 534] 16″ to 19″ [407 to 482]
125cc & over 17″ to 21″ [432 to 534] 16″ to 19″ [407 to 482]
250cc 4-stroke 17″ to 23″ [432 to 586] 16″ to 19″ [407 to 482]

21.18.4 Junior Sidecar: Wheel Sizes

21.18.4.1 The maximum wheel rim sizes for all relevant classes are:

WHEEL

SIZE [Approx. Metric Equivalent]

Front 19″ [482mm]
Rear 16″ [407mm]
Sidecar 14″ [356mm]

21.18.5 Junior Solo: Handlebars

21.18.5.1 Solo handlebars must be securely plugged. and have no greater than the following widths: The width of handlebars must be not less than 600mm and not more than 850mm.

CAPACITY

HANDLEBAR WIDTH

50cc Automatic 630mm or OEM for the model
65cc 750mm
85cc 2 stroke / 150cc 4 stroke 800mm
Over 85cc / 150cc 4 stroke 850mm

21.18.6 Junior Tyres

21.18.6.1 Motocross knobby tyres on the rear of any machine over 85cc 2-stroke and 150cc 4-stroke are prohibited.