CHAPTER 20 4SS (4 Stroke Sprint) Karting

4SS (4 Stroke Sprint)

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5 Preamble

a) The development and Homologation of “Factory Sealed” 4 Stroke engines resolves many of the technical compliance issues so as to allow 4 Stroke engines to be used in Club Competition and

Social Karting activities encompassing the traditional sprint racing format with the underlying principle of fostering greater participation in the sport. b) For the avoidance of doubt, the 4SS Class is considered to be an introductory Class and as such is restricted to use solely in Social Karting and Club Karting Competition and a single State

Trophy Event in each State unless otherwise approved by KA.

Class

a) 4SS (Sprint)

Age

a) Restricted by Licence

Competition Eligibility

a) Club

Licence Requirements

a) Cadet i) A Driver must hold a Cadet 9 or a Cadet 12 Licence b) Junior i) A Driver must hold a maximum of a B Grade Junior Licence. ii) Unless otherwise specified in State Regulations, a Driver who holds an International or a National A Grade Junior licence may Compete at a Club Meeting, however, they will not be eligible for points or awards. c) Senior i) Unless otherwise specified, a Driver must hold a maximum B Grade Senior licence. ii) A Driver over 40 years old may hold an A Grade Senior licence. iii) Unless otherwise specified in State Regulations, a Driver who holds an International or a National A Grade Senior licence may Compete at a Club Meeting, however, they will not be eligible for points or awards.

Chassis

a) Cadet Kart i) Unless otherwise prescribed in these Rules, the Riccardo Kart DR-L28 Kart will be the only Kart permitted for use in 4SS Cadet Competition. 1) The Kart must be manufactured by BirelART and be imported into Australia by Patrizicorse Pty Ltd.; and 2) Must at all times be as homologated by Karting Australia; and 3) The following components of the Kart including the: frame, stub axels, tie rods, steering column, axle, hubs, side pod bars and floor tray shall exhibit the marking DRS. No modification to the construction of any component on the Kart other than those prescribed in these Rules is permitted.

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a. For the sake of clarity, the Kart must at all times use the standard components as manufactured by BirelART with the exception of items such as stickers and pedal extensions. 4) The seat must be as supplied with the Kart (Freeline XS or S). a. The only modification of the seat that is permitted, is the drilling of holes to enable ballast to be mounted. b) Frame i) Must comply with the Rules.

Drivetrain

a) Engine i) One (1) engine is permitted to be fitted to a Kart. ii) Type 1) Briggs & Stratton 206 Factory Sealed including all ancillary components as Homologated. a. The engine must be manufactured by Briggs and Stratton Racing and imported into Australia by IKD. 2) Torini Clubmaxx 210 Factory Sealed including all ancillary components as Homologated. a. The engine must be manufactured by Austech Industries Pty Ltd. 3) Torini Supermaxx 250 Factory Sealed including all ancillary components as Homologated. a. The engine must be manufactured by Austech Industries Pty Ltd. iii) Technical specifications and Homologation Papers for each engine are available at www.karting.net.au iv) Factory Sealing An engine must have at least two (2) factory installed seals properly attached to it in accordance with the homologation papers. 1) Tampering with the seal/s is not permitted. 2) Should the seal/s be tampered with, or any of the seals be broken, the engine is no longer eligible for Competition: a. The Briggs & Stratton 206 has two (2) seals attached – both must be fully intact. b. The Torini Clubmaxx 210 has four (4) seals attached – all must be fully intact. c. The Torini Supermaxx 250 has four (4) seals attached – all must be fully intact. 3) Should an engine require dismantling for any reason that requires breaking of the seals, contact: a. Briggs & Stratton 206: IKD: service@internationalkarting.com b. Torini Clubmaxx 210: Austech Industries Pty Ltd: service@austechindustries.com.au c. Torini Supermaxx 250: Austech Industries Pty Ltd: service@austechindustries.com.au v) Maximum Number of engines permitted to be used by the Driver from the commencement of the first qualifying session at each Meeting. 1) One (1) vi) Eligible engines for each Division.

Cadet Briggs & Stratton 206

Torini Clubmaxx 210

Junior Briggs & Stratton 206

Torini Clubmaxx 210

Senior – Light

Briggs & Stratton 206

Torini Clubmaxx 210

Senior – Medium

Briggs & Stratton 206

Torini Clubmaxx 210

Torini Supermaxx 250

Senior – Heavy

Briggs & Stratton 206

Torini Clubmaxx 210

Torini Supermaxx 250

b) Carburettor i) In accordance with the relevant Homologation. ii) Cadet Engines 1) Torini Clubmaxx TC210 a. Torini Butterfly Carburettor, 16.5mm Venturi (Part No. TC25TECK) with matching inlet manifold (Part No. TC21045) must be used at all times. 2) Briggs & Stratton 206 a. Briggs & Stratton Carburettor Slide - 0.570 (Yellow Briggs and Stratton Restrictor) must be used at all times. c) Induction Noise Silencer i) In accordance with the relevant Homologation d) Exhaust i) Header Pipe 1) In accordance with the relevant Homologation e) Ignition i) Ignition Type 1) In accordance with the relevant Homologation ii) Ignition Kill Switch 1) The OEM kill switch in accordance with the Homologation must be retained and must be fully functional at all times. f) Spark Plug i) In accordance with the relevant Homologation g) Starter i) In accordance with the relevant Homologation h) Cooling i) In accordance with the relevant Homologation h) Transmission i) Gearbox not permitted ii) Side plates or discs with a Maximum diameter of 195mm may be attached to the sprocket or carrier i) Clutch i) In accordance with the relevant Homologation j) Fuel i) Only a KA Permitted Premium Unleaded Petrol (PULP) may be used. k) Oil i) In accordance with the relevant Homologation l) Cadet Restrictor i) In accordance with the relevant Homologation

8 Competition Tyres

a) Dry - Cadet i) Vega VAH 1) Front Tyre size must be: a. 10 x 4.50 x 5 2) Rear Tyre size must be: a. 10 x 4.50 x 5 b) Dry - Junior & Senior i) Vega VAH 1) Front Tyre size must be: a. 10 x 4.50 x 5 2) Rear Tyre size must be: a. 11 x 7.10 x 5 c) Wet – Cadet i) Vega W2 1) Front Tyre size must be: a. 10 x 4.50 x 5 2) Rear Tyre size must be: a. 10 x 4.50 x 5 d) Wet – Junior & Senior i) Vega W2 1) Front Tyre size must be: a. 10 x 4.00 x 5 2) Rear Tyre size must be: a. 11 x 6.50 x 5 e) From the commencement of the first qualifying session at a Meeting, only the following Tyres are permitted to be used during a Meeting unless otherwise advised in Supplementary Regulations: i) one (1) set of Dry Tyres (plus one (1) replacement Dry Tyre if permitted in accordance with the Rules); and ii) one (1) set of Wet Weather Tyres (plus one (1) replacement Wet Weather Tyre if permitted in accordance with the Rules).

Social Karting Tyres

a) Dry i) Vega - VAH ii) Bridgestone – DR1 YJL, DR10 YLR ROK, YDS iii) Dunlop - DFM, DFH, SL1A, RS1 iv) MG – HZ Option (Red/White), AZ-Red, FZ Prime (Yellow) v) MOJO – D2, D3, D4, D5 b) Wet i) Vega - W2 ii) Bridgestone – WER YLP iii) Dunlop – KT14W13, KT12SLW2 iv) MG - WT (White) v) MOJO – W2, W3

General

a) Weight i) Minimum Weight including the Driver: 1) Cadet: 100kg 2) Junior: 130kg 3) Senior - Briggs & Stratton 206, Torini Clubmaxx 210 a. Light: 140kg* b. Medium: 155kg* c. Heavy: 165kg* 4) Senior – Torini Supermaxx 250 a. Medium: 160kg b. Heavy: 175kg ii) The minimum weights specified herein will be the subject of on-going review and possible adjustment at the absolute discretion of KA. b) Data Logging and/or Electronic Dash Display i) Only permitted for the Torini Supermaxx 250 engine. c) Hour Meter i) Permitted d) Apparel i) Refer to Technical Rules – Apparel. ii) Rib protectors are mandatory for all Cadet and Junior Drivers. iii) Neck bRaces and chest protectors are recommended for all Cadet and Junior Drivers. e) Competition Numbers i) Background: 1) Cadet: White 2) Junior: White 3) Senior: Yellow ii) Numbers: 1) Cadet: Red 2) Junior: Black 3) Senior: Black f) Permitted Modifications i) In accordance with the relevant Homologation.

IMPORTANT NOTES FOR CLUBS ABOUT 4SS RACING Introduction

The 4SS Class is, by its very nature and design, an introductory Class in Australian Karting Competition. This brings with it, Drivers who are new to the sport (one of the things that the Class is designed to achieve). Clubs should expect that a significant proportion of Drivers competing in the 4SS Class are relatively inexperienced in kart racing. This applies at all 4SS levels - Cadet, Junior and Senior Divisions. As many 4SS Competitors are “finding their feet” in the sport that is new to them, and they are developing their Race craft, they may be expected to be a little more uncertain than most drivers who are currently racing 2 stroke karts. These notes are provided to help all Clubs ensure that our new drivers get the best experience from their introduction to karting.

Parity Between Engines and Weight Divisions – 4SS Senior

In the development of the 4SS Senior Class, we have tried as best that we can, to ensure that our Light, Medium and Heavy Divisions can all Race together on the track at the same time with good parity by weight for the Light and Medium Divisions and by weight and power for the Senior Division (by including the Torini SuperMaxx 250 for the heavier weight Drivers). As the Class inevitably grows, they won’t be racing together in some Clubs.

It is important for new Clubs hosting 4SS Races to realise that the SuperMaxx 250 and the Light Division will not necessarily be the fastest karts on the track – it is all about Power-to-Weight.

Qualifying

It is very highly recommended that the 4SS Classes have their grid set through a Qualifying Session (even if the other Classes in a Race Meeting are being set by a random grid format.) It provides the safest possible format of gridding, reduces first lap accidents that increase cost, and possible injury and allows the inexperienced Drivers to settle in to racing. This will not add time to the Club Race day as 4SS karts do not need a warmup session so they can be qualified while other classes have their warmup.

The fastest will generally be at the front of the grid regardless of engine type or weight and you will create the safest possible Race.

Questions and Answers

We want our inexperienced Drivers to ask questions. It helps them come to grips with their new sport in a much shorter space of time than if they don’t ask and then make mistakes. People who are new to anything want to learn and it is better that they learn the easy way by asking. Encourage it – please. They are not yet fully familiar with things at the Track that more experienced drivers take for granted – like Supplementary Regulations, Scrutineering, Stewards etc. Many of the adults who are having a go at 4SS racing – because it is fun, cheap motorsport are having their very first motor racing experiences. In our modern society, we expect adults to know everything, but we shouldn’t. Many of our terms and processes are foreign to novices in our sport and we need to nurture them. After all, they are our future long-term participants. Please help them to become comfortable within your Clubs. KA sees 4SS as playing a very important role in bringing repeat numbers of members and event entries to our Clubs. Many of them, once they have settled in and learned a little will want to go faster (because that people in motor racing do), they will progress to a 2-stroke class and become great, long term members of our Clubs – they might just need a little bit of nurturing and encouragement at the start.