Australian TaG Rules
These rules can be downloaded in pdf format HERE (0.8Mb, includes dimensional illustrations).
Preamble
This class provides Australian Karting with a category that allows competitors with a variety of engines to compete with each other on even terms. It is expected that this class will continue to evolve during it’s early life and the promoters of the class reserve the right to alter the technical regulations at short notice to ensure the safety of drivers and the fairness of competition.
It is expected that this class will be the entry point for future TAG engines excluding the future SUPER engines.
Engine
A variety of TAG (Touch and Go) style engines are eligible for use in this category. Engines can be added or removed at any time by the class promoter. Current Eligible engines are:-
1) Biland SA-250
2) PRD Fireball 125cc
3) Rotax Max 125cc
4) Parilla Leopard 125cc
Chassis
- The kart is to conform to the general kart formula as detailed in chapter 25 of the AKA Karting Manual except where specifically mentioned in this chapter.
- Nosecone is compulsory
- Maximum Axle Size 50mm
Brakes
- Front wheel brakes are not permitted
Fuel
- Refer to rule 25.14. Fuel as run to comply under rule 22.01
Tyres
Dry Weather Tyres: Rotax Max: Bridgestone YJC
Iame Leopard: MG Yellow
PRD Fireball: choice of Bridgestone YJC,
MG Yellow, Maxxis HG3
Biland SA250: choice of Bridgestone YJC,
MG Yellow, Maxxis HG3
Wet Weather Tyres: Dunlop KT6 SLW1
Drivers
1. Seniors only holding a provisional AKA C grade license or better
Weights
Rotax: 160kg & 180kg
Leopard: 168kg & 188kg
Fireball: 168kg & 188kg
Biland SA250: 170kg & 190kg
Starting
All engines must be able to be started on board.
External or push starting is not allowed
Carburetors
As per individual class regulations otherwise,
OEM as supplied from the engine manufacturer. Jetting is open however must be OEM type. Washers may be added to the standard needle jets for the purpose of tuning. Carburetor and manifold must be OEM as supplied. Throttle shaft and butterfly must be OEM as supplied. Throttle Slides & components must be OEM as supplied.
Fuel Pump
As per individual class regulations otherwise,
must be of diaphragm pulse type.
Ignition System
As per individual class regulations otherwise,must be OEM as supplied.
Exhaust System
As per individual class regulations otherwise, exhaust and silencers must be OEM as supplied by the engine manufacturer - unless stated differently in an engines class rules.
No plating or ceramic coatings permitted.
Clutch
As per individual class regulations otherwise, must be OEM as supplied by the engine manufacturer. Non adjustable and either single disc or shoe type only. Fireball clutch engagement must not exceed 6000rpm. All other engines must not exceed 3000rpm.
Cooling System
As per AKA requirements see 25.18
Reed Block and Reed Petals (where applicable)
Must be OEM with no modifications.
Parity
In the interest of parity, the promoter reserves the right to alter class weights and or apply engine restrictors to a particular engine.
Specific Engine Regulations
BILAND SA-250
- Only genuine Biland components that are specifically designed and supplied for the SA-250 engine are legal, unless otherwise specified.
- Neither the engine nor any of its ancillaries may be modified in any way likely to improve performance, unless specifically authorised within these rules.
- Only engines numbers imported by International Karting Distributors will be eligible for use in AKA competition.
BILAND SA-250 Technical Specifications
Nominal Capacity 248.4cm3
Original Bore 58.0mm
Theoretical Maximum Bore 58.01mm
Stroke 47mm
Volume of Combustion Chamber 12cm3 (Repair Limit of 0.6cm3)
Compression Ratio 11.35 : 1
Cooling System Water
Carburetor
DELL’ORTO carburettor – 1 per cylinder. Carburettor Diameter 22mm.
- The carburettor body, slide, needle, atomiser tube and atomiser insert is to remain as originally supplied and cannot be subject to any modification. No additions or additional machining, filing, drilling or polishing etc is permitted to these items, this includes the bore/throat.
- “PHBL 22” cast in the housing of the carburettor
- “BD” or “BS” stamped in the housing of the carburettor
- Atomiser Tube stamped with “266DA” or “264DA”
- Needle Stamped with D31 or others as nominated in the future
- Slide Marked #30 Only
- Other settings in the carburettor are free.
Camshaft
Camshaft Drive Type SOHC Belt
Intake Lift 7.5mm
Intake Opening Duration 268 Degree
Intake Timing Opens 25 Degree BTDC
Closes 63 Degree ABDC
Exhaust Lift 7.5mm
Exhaust Opening Duration 268 Degree
Exhaust Timing Opens 65 Degree BBDC
Closes 23 Degree ATDC
Inlet Valve
- Must be genuine item
- Maximum of 1 per cylinder according to the following specification.
Weight 24 GR
Diameter of Valve Stem 5mm
Diameter of Valve Head 26.5mm
Diameter of Seat 23.5mm
Diameter of Duct 21mm
Exhaust Valve
- Must be genuine item
- Maximum 1 per cylinder according to the following specification.
Weight 21 GR
Diameter of Valve Stem 5mm
Diameter of Valve Head 24mm
Diameter of Seat 21mm
Diameter of Duct 23mm
Crankshaft and Conrods
*** Crankshaft Drawing as per current AKA manual ***
Length between axes of Conrod 84.5mm
Weight of Conrod 185 GR
Diameter of Big End 35mm
Diameter of Small End 16mm
Weight of Crankshaft 1720 GR
A1 93mm
A2 93mm
B1 32mm
B2 32mm
C1 20mm
C2 32mm
Piston
Weight of Piston 145 GR Complete
Number of Rings per Piston 3
Parilla Leopard
As per Class rules in AKA Chapter 45
PRD Fireball
CCV 10.0cc min
Minimum Squish 0.036mm
Carburetor Tillotson 360 A. No modifications
Venturi 0.95 inch
Carburetor Bore 1.065 inch
Exhaust Height 174 deg max
Exhaust System OEM Header only,
OEM Straight PRD9037/95A or
Bubble
PRD9037/EVO99A Muffler.
No Modifications to either.
The addition of
Exhaust Gas Temperature fitting is acceptable.
Measurements: A: 100mm, B: 54mm, C: 3mm, D: 170mm, E: 315mm,
F: 170mm, G: 21mm, H: 135mm, I: 455m
±1.00 mm ON ALL MESSUREMENTS
Ignition PRD or PRD/Opama
Parts All must must be OEM unless specified, Non Tech or Other wise
Coatings No coatings to engine componants other than standard are permitted.
Non Tech Items Switches, Battery, Fasteners, spark plugs,
Engine Sprocket, Water
Hoses, Water Pump, Axle Pulley & O Rings.
No alterations from original
manufacturers specification is permitted to fit a non tech item.
Cylinder Must be OEM, All ports and passaged are cast finish except some
pre-existing factory removal of flashing. No further machining or modification is permitted.
Cylinder Head Must be OEM, Modification the Combustion Chamber to achieve min
cc’s is acceptable. No other modifications allowed.
Crankcase Must be OEM with no modifications.
Crankshaft Must be OEM with no modifications.
Conrod Must be OEM, PRD Medium Weight ???grams, No Modifications
PRD Light Weight ????grams – This conrod was fitted to some early
engines. This conrod will no longer be able to be used after 01/07/07
Piston Must be OEM, coated and uncoated pistons allowed. No modifications.
Piston Pin Must be OEM, 10mm ID & 11mm ID PRD Piston Pins Accepted.
10mm ID piston pin to be fazed out by 01/01/08
Clutch PRD Three Shoe Clutch
PRD Light, Medium & Heavy Shoes acceptable.
or
PRD/Horstman FX-100 Clutch
Radiator OEM Recommended. Core and tank size must be with in 5mm of the
drawing. Curved Radiators not allowed.
Rotax Max
As per class rules in chapter 28
These rules should be read in conjunction with the AKA Karting Manual and subsequent ammendments that are made from time to time (see Latest News).
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