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Cadet/Junior Restricted Classes Review Project

Update #2      18-1-13


Further to the update in E-Line #62, 20-11-12, KartSport New Zealand is now in a position to detail further background and report progress on this Project which is a key plank in our Strategic Plan, Item 1, Sustainability and Growth, Strong Sustainable Classes.

Initial work on this Project was commenced in April 2012 by the Class Review Working Group (CRWG), a team of five under the chairmanship of Aarron Cunningham. This work included surveys of competitors/parents, submissions from competitors, karting trade/engine manufacturers and other stakeholders plus research into what other countries have in place or have proposed for these age groups. Other countries such as UK and Australia have completed or are about to commence similar projects. The CRWG tabled its report to the Executive in August 2012.

Later in 2012 KartSport New Zealand was advised by Kiwi Kart, the NZ distributor for the Cadet Raket 85 engine, that Radne plan to cease manufacture of the Raket 85 engine sometime during the next 18 months. While no definite timing is currently available, this information added impetus to the Project. It should be noted that the Raket 85 has been in production for over 23 years.

Former Vice President, Graeme Moore was appointed Project Leader on 3 November 2012. Graeme, who was responsible for the Cadet Chassis Review undertaken in 2008, brings strong commercial management experience to the project. Graeme’s appointment also provides independent leadership.

In order to meet the Key Target Dates below, the following has been progressed: 

An Engine Requirements paper (see outline below) for potential engine has been developed and distributed to selected manufacturers of air/fan cooled engines.

Engines for evaluation are currently being delivered.

A detailed engine evaluation programme, including on track testing, is currently being developed and will be progressed over the next five months.

KartSport New Zealand is acutely aware of the uncertainty this Project will create for Cadet and Junior Restricted competitors and parents. We plan to keep you advised as best we can as it progresses. However as well as addressing the goals of the Strategic Plan (including the significant drop in Junior Restricted class numbers in recent years), we need to be prepared for future decisions made by Radne. Any future engine changes, including transition periods, parity issues, etc, will be fully canvassed with Clubs at the 2013 National Conference.

KartSport New Zealand wishes to acknowledge and thank Graeme Voss of Kiwi Kart for his advice and input into the future of the Cadet class, which was conceived and developed by Graeme in the early 1990’s. It is still business as usual for Kiwi Kart regarding the supply of new Raket 85 engines and spare parts.

Key Target Dates are:

Recommendations to the Executive                                           by 31-7-13

Proposal(s) including timetables recommended to Clubs,
at 2013 National Conference, for adoption                                  24-8-13

Key Points from the Engine Requirements include:

A single base engine to cover the requirements of the age group of 6 to under 13 or 14 years.

The two different levels of power output required for the Cadet and JR age group engines will be achieved by changing the specification and/or a small number of components of the same basic engine.

KartSport New Zealand does not wish to change the configuration of the current Cadet chassis specification nor obsolete the chassis fleet currently in use in the JR class. Therefore any new engine must fit both of the respective existing chassis fleets.

Any proposed new engine option to be “stock off the shelf” with nil or minimal modification allowed, manufacturer prepared specifications and able to be simply upgraded/downgraded for use in both age group classes.

Engine should not result in a significant increase in respective age group MAW’s.

Similar on track performance to current class engines respectively.

Air and/or fan cooled.

Pull start or electric or external starting.

Low slip dry clutch mandatory.

Have an engine cut out switch (Rule K1.18).

Either fixed jet float chamber or diaphragm carburettor. (not adjustable by competitor when in motion for Cadet age group).

Manufactured to fine tolerances. Engines to have machined ports (CNC or similar process).

Meet KartSport New Zealand Noise Limits (Rule M4).

Use Pump petrol (Rule L4) and must be capable of operating at full efficiency on 95 RON petrol.

2 stroke using a CIK homologated oil.

Standard ECU/Ignition unit. Variable ignition units not permitted. Ignition or ECU parameters and/or mapping will be required and this will form part of the specifications.

Use a standard, readily available spark plug.

Electronically fixed maximum rpm limit for each age group specification is desirable.

Single Standard Intake Silencer for both age group classes (either proprietary or current Rule L5 Option A) with (preferably) an internal filter.

Class upgrade and downgrade kits must be available as spare parts and be able to be fitted by a typical competent kart mechanic/parent.


Further announcements regarding this Review will be made as the project progresses. 

For further information please contact:

Graeme Moore
Project Leader


KartSport New Zealand