MANUAL OF MOTORCYCLE SPORT - Motorcycling Australia

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20 DIRT TRACK enjoy the ride 196 20.2.2.16 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. 20.2.2.17 The sidecar mudguard must cover at least 180° of the periphery of the wheel and be valanced to baseboard level on both sides. 20.2.2.18 All footrests, brake levers, and gear levers on the opposite side of the motorcycle to the sidecar must be folding, or be shielded by a continuous bar of 12mm minimum diameter. 20.2.2.19 Any open area between the footrests, the continuous bar and the offside of the motorcycle must be filled in with a suitable material. 20.3 NOISE EMISSIONS - DIRT TRACK 20.3.1 Noise emissions must not exceed limits in GCR 12.10. 96db(A) unless a lower limit is provided for in SR. 20.3.2 Noise emission levels will be measured as shown at 12.10.2. 20.4 MACHINE & RIDER IDENTIFICATION - DIRT TRACK 20.4.0.1 No Junior or Senior may compete without back numbers, the machine identification number on their back must be in contrasting colours and with a minimum size of 125mm height and 20mm width of stroke. 20.5 FUEL - DIRT TRACK 20.5.0.1 Fuel for all Dirt Track machines must: a) Be Unleaded, and b) Be no more than 100 RON, and c) Contain no additives other than those added at the point of manufacture except for: (i) lubricating oil for 2-stk engines (ii) Upper cylinder lubricant for 4 stroke engines. d) Be readily available from retail petrol pumps within Australia; or e) Be a brand of fuel homologated by MA that is compatible with the “Fuel Quality Standards Act 2000”, 20.5.0.2 In addition, for Senior and Classic competition, commercially manufactured pure Methanol with no additives other than lubricating oil may be used. 20.5.0.3 Environmental Protection - An absorbent mat that measures 500x500mm 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. 20.6 JUNIOR CLASSES - DIRT TRACK 20.6.0.1 50cc motorcycles are to comply with GCR 12.17. 20.6.0.2 Type of tyre to be used in Junior Dirt Track competition must be stipulated in the Supplementary Regulations 20.6.0.3 Motocross knobby tyres on the rear of any machine over 85cc 2-stroke and 150cc 4-stroke are not allowed. 20.7 CLASSES - DIRT TRACK 20.7.0.1 The capacity classes for senior machines are: Classes Capacities **Under 19 150cc 2 stroke & 250cc 4 stroke **Pro 250 Lites 100cc to 150cc 2 stroke & 200cc to 250cc 4 stroke Pro 450 Open 250cc 2 stroke & 450cc 4 stroke 250cc Slider 150cc 2 stk & Up to 250cc 4 stk MX Open 500cc 2 stk & over 460cc 4 stk ** Pro Open Unlimited (MX & Sliders) Unlimited Pro Open Unlimited Women 1100cc Dirt Up to 1100cc Track Sidecar Quad Pro 450 up to 350cc 2 stk & 450cc 4 stk Quad Open Up to 550cc 2 stk & 700cc 4 stk Quads Open Up to 550cc 2 stroke & 700cc Women 4 stroke **NOTE: Where there are insufficient entries for the 250cc slider class, these machines may be combined with the events marked **. MACHINES MUST HAVE FRONT & REAR BRAKES Riders are eligible to enter one class above capacity of the machine entered for Senior riders only. 20.7.0.2 Machines competing in any 1,100cc sidecar event: a) Supercharged and turbocharged engines must not exceed 500cc, b) On liquid-cooled engines, an overflow pipe must direct any overflow of coolant away from the rider and passenger.
2013 MANUAL OF MOTORCYCLE SPORT 20 DIRT TRACK 20.7.0.3 The capacity classes for junior machines are: Classes Capacities 50cc Demo Div 1 4-U9 Yrs 50cc Auto Div 2 7-U9 Yrs 65cc 7-U9 Yrs, 9–U 13 YRS 85cc 2 Stroke & 150cc 4 Stroke, Standard Wheel 9-U11 Yrs, 11-U13 Yrs, **85cc 2 Stroke & 150cc 4 Stroke, Big Wheel 85cc 2 Stroke & 150cc 4 Stroke, Standard & Big Wheel, Girls **85cc 2 Stroke & 150cc 4 Stroke, Slider only 13-U16 Yrs 11-U13 Yrs, 13-U16 Yrs 11-U16 Yrs 13-U16 Yrs 85cc 4 Stroke Modified 7-U10 Yrs, 10- U14 Yrs 85cc 2 stroke/150cc 4 stroke 9-U13 Yrs, 13- sidecars U16 Yrs Rider & Pass **100cc 2 Stroke to 150cc 2 13-U16 Yrs Stroke 100cc to 150cc 2 Stroke & 200cc 13-U16 Yrs to 250cc 4 Stroke, Girls **100cc to 150cc 2 Stroke & 13-U16 Yrs 200cc to 250cc 4 Stroke **100cc to 150cc 2 Stroke & 13-U16 Yrs 200cc to 250cc 4 Stroke, Slider only **200cc to 250cc 4 Stroke 13-U16 Yrs **NOTE: Where there are insufficient entries for the slider classes, these machines may be combined with events marked**. ALL MACHINES MUST HAVE FRONT & REAR BRAKES. (Applicable ONLY to riders 13 to under 16 Yrs, and at the discretion of the RCB). Note: the 85cc 2 Stroke & 150cc 4 Stroke classes may be combined at the discretion of the RCB if numbers are insignificant for separate classes. 20.7.0.4 85cc 4 stroke modified. OEM Frame, 2 valve cylinder head, standard gearbox and number of gears to be retained. 20.8 COMPETITION RULES - DIRT TRACK 20.8.1 Entries 20.8.1.1 No machine may be entered more than once in a class. 20.8.1.2 Any machine, which is entered in more than 1 class, must display the allocated riding number for that class on all 3 number plates when being used in each class. 20.8.2 Practice and Qualifying 20.8.2.1 Practice and qualifying shall be as prescribed in SR. 20.8.3 Starts 20.8.3.1 The method of starting will be prescribed in SR. 20.8.3.2 Starting positions will be prescribed in SR. 20.8.3.3 Unless otherwise determined in the SR’s all Competitors must be called to the start line at least 2 minutes before each start,. 20.8.3.4 Classes must mirror those set down in the MOMs for track and dirt track competition in open and championship events. 20.8.3.5 Prize money: The amount of prize money for Australian Championships will be included in the SR. 20.9 AUSTRALIAN SENIOR AND JUNIOR DIRT TRACK CHAMPIONSHIPS FORMAT 20.9.1 Preferred Championship Dates 20.9.1.1 The Australian Junior Dirt Track Championship shall where possible, be conducted in the July school holidays. 20.9.1.2 The Australian Senior Dirt Track Championship shall where possible, be conducted on the June long weekend, 20.9.1.3 Both the Australian Senior and Junior Dirt Track Championships will be conducted as single meetings at venues selected by the Dirt Track and Track Commission. 20.9.2 Solo Format where there are more than 12 entries per class 20.9.2.1 The championship comprises: a) 4 3 qualifying heats of 3 laps, b) 1 race repecharge of 4 laps, c) 1 race final comprising 6 of 4 laps. 20.9.3 Solo Format where there are 12 or less entries per class 20.9.3.1 The championship comprises: 5 races of 4 laps. 20.9.3.2 Points accumulated by each competitor in the 5 races will determine the Championship placings. 20.9.4 Heats and Final 20.9.4.1 The number of heat positions must not exceed 12. 20.9.4.2 The right to compete in the final will be filled by: a) The 10 competitors accumulating the highest number of points during the course of heats, b) The first 2 placings of the repecharge. 197
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