This class offers increased performance for Junior drivers in the year of 13th birthday to end of Year of 15th birthday and Senior drivers restricted by licence type. This is a competitive class where skills learned in Cadet 9, 12 and KA4 are used. This is the highest level for Junior drivers at club level. It offers two weight classes with the opportunity for fast and close racing. This class was formerly known as ‘Clubman’
Approx. Power – 22hp

Licence Requirements

Junior must hold a minimum ‘B’ Grade junior licence.
Senior must hold a senior licence (remember we are only talking club events)


As from the 2016 Karting Australia Manual

  • Rib protectors are mandatory for all Junior Drivers
  • Neck braces and chest protectors are recommended for all Drivers.
  • Full face approved helmet
  • One piece driving suit with full length sleeves and trousers
  • Full fingered gloves
  • Abrasion resistant shoes to cover ankles
  • KA3 Chassis

    Karting Australia states that the chassis must comply with all rules as described in the 2016 Karting Australia Handbook.There are no specific conditions that apply to this class. Because there is a heavy and light division in this class and both juniors and seniors can compete (not against each other) there are a wide variety of chassis in use. Depending on your weight popular chassis types that may be considered;

  • Lighter Junior Drivers may use a 28mm chassis with 30mm front cross beam (28/30) and a 30mm or 40mm rear axle.
  • Senior drivers with more weight might choose a chassis with 30mm tube and 32mm front cross beam (30/32). With either 40mm or 50mm rear axles.
  • Depending on the height of the driver a wheel base of 1030mm or 1040mm is available. There are many manufacturers of this kart class, you can choose from Arrow, Deadly, Monaco, FA, CRG, Tony Kart, Kosmic, Ricciardo and many more. We suggest you look for a brand that is commonly raced in the Griffith Kart Club, this will ensure availability of spare parts and advice from other experienced club members. Please make contact with the Kart Club as we can put you in contact with members that will have experience and can help you make a choice.

    KA3 Engines

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    Most competitors in this class use the IAME KA100 engine unrestricted. This will provide the best performance and reliability. The class can use the YAMAHA KT100SEC, KT100SE, KT100SD subject to technical engine regulations. On track performance has shown the IAME KA100 is a superior engine with better performance. The IAME KA100 is the preferred engine to be used in this class with better maintenance, reliability and re-sale values than the older Yamaha engines.

    KA4 Tyres

    As per Karting Australia 2016 rules the following tyres are to be used in this class.For dry weather use Bridgestone Dunlop DFM, Front tyre size must be 10 x 4.50 – 5, Rear tyre size must be 11 x 7.10 – 5. Wet weather tyres are Bridgestone Dunlop KT14W13 Front Tyre size must be 10 x 4.50 – 5, rear tyre size must be 11 x 6.50 – 5.

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