Vortex DVS Completes KartSport’s Revamped 

Engine Line Up

KartSport New Zealand is pleased to announce an exciting new engine ratification for the Junior and Senior Age Groups. The Vortex ROK DVS will be sanctioned for Non-Championship competition from 1 May 2018 and for Championship competition from 1 July 2018, in the same specification, for a period of at least 10 years.

President Graeme Moore: DVS_with_guard-clear (002).jpg
“We are delivering a back to the future option for New Zealand karters with the engine filling a gap left by the Yamaha KT100 and providing an alternative to current TaG (Touch and Go) offerings. 

A state of the art water-cooled engine but without all the complexity of batteries, starter motors and clutches. Yes, a push start engine. KartSport see this offering as a simple yet modern and reliable option that harks back to the simpler, lighter days of old. An engine that will offer Junior and Senior competitors a raw yet sophisticated karting experience with throttle response to match. 

Of particular interest, and a real benefit to karters, is the commitment from Vortex to retain all performance related aspects of the engine unchanged for a minimum of 10 years”.

Moore added “This is a final step of providing both entry level options with the likes of the Briggs LO206 as well as performance packages and now, with the addition of the Vortex DVS, a karter can transition through all levels of national competition from the age of 6 (Cadet) to Senior/Masters with just one engine change.”

The Vortex DVS is a 125 cc two stroke direct drive engine specifically designed for karting racing purposes. AVortexcnc.jpg decompression valve in the cylinder head allows the engine to start by a simple and easy push of the kart (much like a KZ2). The engine will be supplied with a Dell’Orto 24mm carburettor, the ignition is PVL with a 14,000 rpm limiter and the exhaust is OEM spec. Parity of performance is paramount to Vortex. All key engine parts are CNC machined, checked for conformity with precision measuring equipment and easily verified at event technical inspections. (Pic: Vortex CNC machine)

The same engine specification will be used for Junior and Senior classes, so the only difference will be the MAW. Detailed class and engine specifications will be confirmed early in 2018.

A RRP of $NZD 4,500 including gst for the engine kit (engine, carb, fuel pump, pipe and air box) has been set and distribution in New Zealand will be via the Vortex NZ distributor, Supreme Karts Supplies (Maurice and Kane Frost).

Moore: "Increasing numbers of Kiwi Karters are competing at the highest levels both in New Zealand and Internationally and the new Vortex DVS will provide another excellent option to hone their skills and advance their careers on the world stage as well as providing a simple yet sophisticated Club Day option.”

This announcement is the conclusion of a project referred to in October 2016 and formally announced in November 2016

The ROK Cup

Vortex is providing championship prize opportunities with a minimum of two invitations for Junior competitors and two for Senior competitors to take part in the ROK CUP International Finals taking place every year in October in Italy. Recipients will be selected by KartSport New Zealand following competition in KartSport New Zealand Championship events and/or other events/series (eg ROK Cup) as determined by KartSport New Zealand. 

The awards will include: ROK CUP LOGO NEW ZEALAND new NZLcrop500.jpg

- free entry 

- free complete kart for the race (OTK chassis + engine) 

- tyres for the race 

- free paddock spot and tent 

- hotel accommodation for the race days (for the driver) - free lunch 

Vortex DVS Engine Backgrounder

The Vortex Factory (a division of OTK Kart Group SRL) started DVS engine production in 2014. Vortex DVS is a CIK-FIA OK class type engine whose development was “frozen” in 2015 allowing ASNs and organizations adopting the DVS engine to run a class like CIK/FIA OK engine class, without having the hassle of constant development and changes.

New Zealand is in good company. The Italian ROK Cup adopted Vortex DVS as a spec class in 2015 and wasAcademy_trophy_Kristianstad2.jpg soon followed by other countries around the world like Mexico, Australia, Denmark, Singapore, South Africa and Poland. 

Presently a number of South American countries are evaluating the possibility to also adopt the Vortex DVS engine as the spec engine for their national CIK-FIA OK classes.

The variant (with the Dell’Orto carburettor) chosen for NZ is the same as that used by the CIK-FIA Academy Trophy class (Pic: taken at Kristianstad, Sweden in 2016)  and other Academy Trophy classes run in France, Germany and South Africa. 

The engine is very similar (except for the carburettor) to that raced in Australia for the KA2 class.

Reliability and ease of use (including tuning) have been key features of the specification chosen for NZ.

It is proposed to run the Vortex DVS classes off the front of the respective Yamaha grids in the short to medium term as both are push start classes.


Single-cylinder 2 stroke engineDVS_onkartabove.JPG

Displacement 125 cc

Reed valve intake in the crankcase

Liquid-cooled through external pump & radiator

Push-to-start system with decompression valve (auto closing)


PVL Digital Ignition with 14,000 rpm limiter

Dellorto 24mm Slide Fixed Jet Carb (as used in CIK-FIA Academy class)

KG Nitro intake silencer with 23mm tubes

Bore and stroke 54x54mm

Cast iron cylinder which can be honed from size to size when necessary

5/3 transfer ducts intake

Oval exhaust and 2 boosters

All ports are CNC machined

Piston ring C type for increased reliability

Balance shaft for reduced vibrations

ROK DVS exhaust with integrated silencer

Radial main bearings C4


Complete engineDVS_headcloseup2.jpg

Replaceable drive sprocket (not fitted to engine, optional Z11 or Z12 in ancillaries’ carton)

Complete PVL ignition system with 14.000 rpm limiter

Dell’Orto VHST 24mm carburettor

Exhaust manifold, spacers (x2), gaskets, pipe and springs

KG Nitro Air box with 23mm tubes

Dell’Orto fuel pump

Fuel pump support

Nuts, bolts and silent blocks for fuel pump

Fuel hose

Spark plug

Spark plug cup

Drive sprocket cover

Installation and Operational Manual 

Water pump and radiator (minimum volume will be specified) can be any brand so that competitors can utilise existing equipment. However Supreme Kart Supplies will offer a new cooling system kit package option if required.

For further information please contact:

Maurice or Kane Frost
Supreme Kart Supplies and Engines
79 Hurlstone Drive, New Plymouth
Phone/Fax: 06 758 8891

Vortex logo.png


KartSport New Zealand