Now it's easy to setup a Rotax 125 MINI MAX kart engine.

KartMAX MINI Jetting Software is a tool designed for use with the Rotax 125 MINI MAX kart engine.

The purpose of this tool is to recommend a jet, needle position and spark reference, taking in consideration the weather conditions on the racetrack.


With this utility, engine-tuning headaches ended. Just enter weather conditions and KartMAX MINI proposes theoretical values for the best engine performance.

In addition, the fine-tuning allows correcting small differences with some engines.


To design this software, data has been taken for more than seven years at racetracks all over the world in order to develop the best possible algorithm.

This data acquisition has allowed designing a very accurate but really easy to handle software, so it can be used by beginners and expert drivers. Also data and comments for users from all over the world have been taken into consideration.

KartMAX MINI only supports Rotax 125 MINI MAX engines.

Max, DD2, Junior and Micro aren't supported in this version.

KartMAX MINI is designed be used in with Dell'Orto Carb standard settings for MAX Challenge:

8.5 or 12.5 Venturi inserts
K98 needle
3.6 floats - #60 idle jet - #60 inner idle jet
5.2 floats - #30 idle jet - #30 inner idle jet
2:100 oil/fuel ratio

Special carburetor config used in Spain & Portugal is also supported.

If you have any problem using this software, please, contact us. We are always trying to improve it.

Weather data

KartMAX MINI allows to obtain meteorological data through geolocation if you have internet access, which avoids having to carry a weather station to the racetrack.


Location data are completely anonymous, shared with the World Weather Online server to get weather data and recorded on our servers for statistical purposes. This information is anonymous and is not used for any other purpose.

Location rights of the App can be modified at any time in Settings -> Privacy -> Location

In the event that the server data were not precise enough, we recommend using a first-class weather station. If weather station incorporates altitude/pressure correction, please introduce altitude "0" in KartMAX MINI.

Carb-Ice Warning

KartMAX MINI now incorporates a warning sign of ice formation in the carburetor.

Carb-Ice is caused as the carburettor vaporizes fuel. It cools the intake air. If the air temperature drops below dew point, moisture in the air condenses into water droplets. Ice forms near the carb slide and venturi when water touch carb walls that are cold.

In severe cases (high humidity, low temp), ice can block jets, resulting in an unexplained progressive lost of engine power even at temperatures above 25ºC (77ºK). The effect is temporary, so it can not be diagnosed in boxes.

KartMAX MINI includes a warning sign with three levels of risk:

Low risk
Medium risk
High risk

To reduce the risk of carb-ice is recommended to use a quality fuel, avoiding any water contamination, and take the air filter clean and oiled.

For more information, WikiPedia.org

Lap chronograph

Record all your circuits, sessions, drivers and times.

Professional chronograph. Get times up to four drivers at the same time.


Get best times for circuits, sessions, personal times, lap differences, etc.

Share your best results over Twitter or Facebook

Colors meaning:

1'35"93 Best Circuit time

1'41"12 Best Session time

1'53"47 Personal best time in this session


Customer reviews

Spain Team nico 7 star star star star star

Fab and easy to use quick

Other translations

Want to see KartMAX MINI in your language? We would appreciate if you wanted to help us translate it.


Weather services