KARTFIN1 10 cm wide.JPG

Rok logo dec13.jpg



History Page & ROK Newsletters


This Project had its beginnings with adoption of the current KartSport New Zealand Strategic Plan in 2011. Strategic Plan Item 1, Sustainability and Growth, Strong Sustainable Classes, was addressed through the establishment of a Class Review Working Group (CRWG) in April 2012.

However the Project was escalated in November 2012 when, following information that Radne planned to cease manufacture of the Cadet Raket 85 engine within a relatively short time scale. Graeme Moore was appointed Project Manger with the target of taking a recommendation for a replacement for both the Cadet Raket 85 and Junior Restricted Yamaha KT100S engines to the August 2013 KartSport New Zealand Executive Meeting. After an extensive and intensive effort this target was achieved.

The Vortex Kiwi Mini ROK engine selection decision was endorsed by affiliated Clubs at the 2013 KartSport New Zealand National Conference on 24 August 2013.

KartSport New Zealand would like to thank all those involved along the way including the unsuccessful engine manufacturers, testing team, advisors and Graeme for his project leadership.

Below is the original Terms of Reference for the CRWG plus links to the various Project Updates issued during the Project.

CRWG Terms of Reference April 2012


In line with the KartSport New Zealand Strategic, Plan Item 1, Sustainability and Growth, Strong Sustainable Classes, the Executive has determined that the first Classes to be reviewed will be the Cadet/Junior Restricted age groups.

While Cadet numbers currently remain relatively strong the transition upwards from Cadet via JR appears to be a roadblock for many competitors (read families) transitioning through to Junior and Senior classes. (Ref Appendix 1 Class membership History Charts). Competitors lost at this stage seldom return as they go on to find other sports and peer groups.

While Cadet is the obvious entry level class for younger new members, we struggle to attract many new members in the next entry level (JR) age group. (Ref Appendix 2 New Member Charts). Is the unavailability of a competitive “off the shelf” cost effective engine package an issue regarding lack of new entrants at JR age group?

There is anecdotal evidence that the cost of moving from Cadet to Junior Restricted Yamaha is an issue, especially the real, or perceived, cost of purchasing and “old generation barrel” Yamaha engine, however there are other issues including wider variety/cost of JR chassis, higher running costs (tyres/clutches/rebuilds) which are a magnitude higher than for Cadet. Also the relatively short period many competitors spend in JR means that some people shy away from making an investment which will need to be repeated again when moving on to Junior classes. (Ref Appendix 3 ref JR Set Up costs)

CRWG Objectives

·         To review current issues regarding both the Cadet and JR classes. (eg technical, availability, purchase cost, running costs).

·         To review current engines with a view to improvement/modification/adjustment should minor change be sufficient to address current and anticipated future issues.

·         To review/compare with current class/age/MAW structures for 6-14 year olds in overseas markets.

·         To investigate same engine options which would cover (with minor modification/additions) both the Cadet and JR age groups (including, if recommended adjusted, age groupings). Ie carry same basic engine through from Cadet to JR.

·         Any proposed new engine options must fit existing Cadet and JR chassis stock and current restricted tyres and ideally not result in an increase of MAW more than 10kg respectively. On track performance no faster than current front running Cadet and JR karts. Electric or pull start with clutch.

·         Any proposed new engine options to be “stock off the shelf” with nil or minimal modification allowed and manufacturer prepared specifications. Engines to have machined ports.

·         If new engine options are to be recommended, to recommend a short list, minimum of three, engine options which, on paper, would be suitable. Short list to include full technical specifications, weight (including all ancillaries/coolant/gear oil/inlet silencer/exhaust/battery/loom/etc.), manufacturer details, current overseas use and history for each engine respectively. Also short listed engines recommended must consider and detail :-

o   - longevity

o   - stability (no changes)

o   - continuance of supply

o   - availability and controls of spare parts

·         To recommend a testing regime to evaluate short listed engine options.

·         To draft a set of generic specifications/requirements which could be used in a supplier contract for engines.

·         To recommend a timetable for any recommended changes (phase in/phase out/championship status).


Here are the Project Updates:

Update #1      20-11-12

Update #2      18-1-13

Update #3       6-3-13

Update #4       4-5-13

Update #5       26-8-13

Update #6       17-1-14

ROK Newsletters

To receive these Newsletters direct, please register your name, engine number(s) and email address HERE

Newsletter #1    1-4-14

Newsletter #2    23-5-14

Newsletter #3    17-6-14

Newsletter #4    26-8-14

Newsletter #5    2-10-14

Newsletter #6    11-2-15

Newsletter #7     3-5-15

Newsletter #8    14-10-15


KartSport New Zealand