# Jetting Rotax Max Kart — for Micro, Mini Junior Max DD2

> Kart engine jetting optimization based on environmental data and engine configuration. (iPhone/iPad app by Ballistic Solutions LLC.)

- Source: https://appshunter.io/ios/app/jetting-rotax-max-kart/id1453317954 (this page in markdown: same URL + `.md`)
- Developer: [Ballistic Solutions LLC](https://appshunter.io/developer/1611909747)
- Category: Sports, Utilities
- Price: $7.99
- Rating: 4.90/5 from 9 App Store ratings · 24 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 40 MB
- Languages: Russian, Vietnamese, American English, Arabic, Hungarian, Dutch, Greek, Danish, Hebrew, Indonesian and 22 more
- Released: 2019-02-18
- Data updated: 2026-08-30
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/jetting-rotax-max-kart/id1453317954/reviews.md

## What is Jetting Rotax Max Kart?

This app provides, using temperature, altitude, humidity, atmospheric pressure and your engine configuration, a recommendation about jetting for karts with Rotax 125 Max non-EVO engines, which use a Dellorto VHSB 34 QS/QD carbs:
• Micro with stop sleeve RTX251730
• Micro/Mini with restrictor RTX267530 or RTX267535
• Micro/Mini without any restrictors
• Junior
• Senior
• DD2
• Supermax

This app can obtain automatically the position and altitude to get the temperature, pressure and humidity from the nearest weather station thought internet. Internal barometer is used on supported devices for better precision. Application can run without GPS, WiFi and internet, in this case user has to enter weather data manually.

• Two different tuning modes: "By regulations" and "Freestyle"!
• In first mode, the following values are given: main jet, spark plug, spark plug gap, needle type and position (including intermediate positions with washer), air screw position, idle screw position, optimal water temp, gear oil recommendation
• In second mode (Freestyle), the following values are given: main jet, spark plug, emulsion tube, needle, needle type and position (including intermediate positions with washer), venturi, idle jet (outer pilot jet), idle emulsifier (inner pilot jet), air screw position
• Fine tuning for all these values
• History of all your jetting setups
• Graphic display of fuel mix quality (Air/Flow Ratio or Lambda)
• Selectable fuel type (VP MS93, gasoline with or without ethanol)
• Adjustable fuel/oil ratio
• Adjustable floats height
• Mix wizard to get the perfect mix ratio (fuel calculator)
• Carburetor ice warning
• Possibility of use automatic weather data or a portable weather station.
• If you don't want to share your location, you can manually select any place in the world, jetting recommendation will be adapted for this place
• let you use different measure units: ºC y ºF for temperatures, meter and feet for altitude, liters, ml, gallons, oz for fuel, and mb, hPa, mmHg, inHg atm for pressures

The application contains four tabs, which are described next:

• Results: In this tab two jetting setups are shown. These data are calculated depending on the weather conditions and the engine and track configuration given in the next tabs.
  This tab lets do a fine tuning adjustment for all values for each jetting setup to adapt to the concrete engine.
  Besides this jetting information, the air density, density altitude, relative air density, SAE - dyno correction factor, station pressure, SAE - relative horsepower, oxygen pressure and volumetric content of oxygen are shown too.
  You can also see in a graphic form the calculated ratio of air and fuel (lambda).

• History: This tab contains the history of all jetting setups. If you change the weather, or engine setup, or fine tuning, the new setup will be saved in history.

• Engine: You can configure in this screen the information about the engine, that is, engine model (Micro Max, Mini Max, Junior Max, Senior, Max DD2), needle type, float type and height, venturi (8.5 or 12.5), idle jet, idle emulsifier, fuel type, oil mix ratio and type of the track. Depending of this parameters, the jetting setups will be adapted.

• Weather: In this tab, you can set the values for current temperature, pressure, altitude and humidity. 
  Also this tab allows to use the GPS to get the current position and altitude, and connect to an external service to get the weather conditions of the nearest weather station.
  In addition, this app can work with a pressure sensor built into the iPhone. You can see if it is available on your device and turn it on or off.

For Rotax Max EVO Engine please try our other app: Jetting Rotax Max Evo Kart.

If you have any doubt about using this App, please, contact us. We answer every question, and we take care of all comments from our users to try to improve our software. We are also users of this application.

## Key features

- Jetting recommendations for Rotax 125 Max engines
- Automatic weather data acquisition
- Two tuning modes: 'By regulations' and 'Freestyle'
- Detailed tuning parameters
- History of jetting setups
- Graphic display of fuel mix quality
- Adjustable fuel/oil ratio

## Recent user reviews (10 of 24)

All indexed reviews: https://appshunter.io/ios/app/jetting-rotax-max-kart/id1453317954/reviews.md

### 5/5 — Rotax Junjor

*2026-04-07, version 2.3*

Bei uns hat die App gut funktioniert. Wichtig ist zu wissen was im Vergaser verbaut ist, damit auch die richtigen Werte raus kommen.

### 4/5 — Ошибка

*2023-08-06, version 2.2*

При выборе на вкладке Двигатель параметра — «3,6 g (idle jet = 30, idle emulsifier = B60) – best opinion with needle K98» на вкладке Результаты параметры остаются: idle jet — 60, idle emulsifier = B60.

Исправьте пожалуйста 🙏

### 3/5 — Jetting Rotax max

*2021-02-17, version 2.1*

Температура ставится только до -10 , положение иглы вообще неменяется во fristaile

### 1/5 — App no good

*2020-11-22, version 2.0*

Paid $13 for an app to tell me that my kart that is leaning out too much with a 160 jet needs a 120 jet. That makes complete sense. Also the app doesn’t allow for changing the idle jet sizes. I run 60/30 idle jets and it only allows 60/60 or 30/30. If the app developers could refund my money that would be great. Thank you.

### 5/5 — Good

*2019-12-21, version 1.7*

We use this app for senior and dd2 classes and karts runs much better. Amazing

### 5/5 — Good

*2019-10-24*

Power feels great with base setups for my weather and location. Senior and micro class.

### 5/5 — Good

*2019-10-17*

Jetted my micro with the reccomended values and kart runs better!

### 5/5 — Good

*2019-08-28*

Power feels great with base setups for my weather and location. Senior class.

### 5/5 — Good

*2019-04-08, version 1.1*

Super! I always hits the target with this app. With lambda (A/F) feature I understood how carb works. Strongly recommend.

### 5/5 — Good

*2019-04-07, version 1.1*

Simple and save a lot of time for me.

## Frequently asked questions about Jetting Rotax Max Kart

### What Rotax Max engines does Jetting Rotax Max Kart support?

Jetting Rotax Max Kart supports Rotax 125 Max non-EVO engines, including Micro, Mini Junior, DD2, and Supermax variants. It specifically caters to engines using Dellorto VHSB 34 QS/QD carbs with various restrictor configurations.

### How does Jetting Rotax Max Kart get weather data?

The app can automatically obtain temperature, altitude, humidity, and atmospheric pressure from the nearest weather station via the internet. For enhanced precision on supported devices, it can also utilize an internal barometer. Manual entry of weather data is also possible.

### What are the two tuning modes in Jetting Rotax Max Kart?

Jetting Rotax Max Kart offers 'By regulations' mode, which provides specific values like main jet, spark plug, and air screw position, and 'Freestyle' mode, which offers a broader range of adjustable parameters for advanced tuning.

### Can I adjust fuel and oil ratios in Jetting Rotax Max Kart?

Yes, the app allows for an adjustable fuel/oil ratio and includes a 'Mix wizard' to help calculate the perfect mix ratio for your kart's engine.

### Does Jetting Rotax Max Kart have ads?

No, Jetting Rotax Max Kart does not contain advertisements. It is a paid application designed to provide a focused and uninterrupted tuning experience.

### What units can Jetting Rotax Max Kart display?

The application supports various measurement units, including Celsius and Fahrenheit for temperature, meters and feet for altitude, and different units for fuel and pressure.

### How often is Jetting Rotax Max Kart updated?

The latest version of Jetting Rotax Max Kart is 2.3, which was last updated on January 30, 2025. Updates typically include improvements and new features based on user feedback and engine technology advancements.

### What is the price of Jetting Rotax Max Kart?

Jetting Rotax Max Kart is available for a one-time purchase of $7.99. This price grants you full access to all features and tuning capabilities without any recurring subscription fees.

## Version history (last 5 releases)

### 2.3 — 2025-01-30

• Added ability selection of carburetor restrictors for Mini and Micro engines (RTX251730, RTX267530, RTX267535, or without any restrictors)
• Added new feature: get weather (temperature, pressure, humidity) via Bluetooth using weather stations: Kestrel DROP, Kestrel 5x00, WeatherFlow WEATHERmeter, Skywatch BL
• Added new feature: added the ability to calibrate the barometer built into your phone or tablet (go to the “Settings“ tab, then “Measurement units“)
• Added new feature: added various utilities (unit converters) (go to the “Settings“ tab, then “Utils“)
• We have improved our weather calculator significantly. Now you can manually select which type of atmospheric pressure you are working with (for example if you use portable barometers, weather stations):
- sea level pressure QNH
- sea level pressure QFF
- station pressure (barometric pressure)
• Now, if you don’t want to see intermediate (half-steps) positions for the needle, you can turn it off on the 'Engine' tab
• New type of fuels have been added: VP Racing MS93 and 93 AKI with ethanol. Please check which fuel you are using
• On the results tab, click on the drop-down menu 'Weather (AirLab)', new data for tuners are available: Air Density, Relative Air Density, Density Altitude, Station Pressure, SAE - Dyno Correction Factor, SAE - Relative Horsepower, Volumetric Content Of Oxygen, Oxygen Pressure
• In the 'Results' tab, we added recommendations about spark plug gaps, positions for idle adjustment screw, optimal water temperature, gear oil recommendations
• Improved functionality and accuracy of fuel calculator
• Bug fixes for "share setup with friends" feature
• Added new type of spark plug: NGK Rotax
• Improved functionality for the feature 'Weather for custom location'. We added a search bar where you can enter the location name. Search places easier and faster now
• We reworked the altitude determination algorithm for the 'weather for custom location' feature. We hope that now, if you manually selected your location, the altitude will be calculated with much greater accuracy
• We added the ability to leave text notes for each history in 'History' tab. To do this, open any History, enter edit mode and add a note
• Now you can manually select the translation language. Application contains many special terms and sometimes translations that we offer are not always good. We are sorry. Now, if your phone (for example) in German, but you are unhappy with the translation you can switch to English (for example) only in this app (you don't have to change locale of device). You can find this feature on 'Engine' tab at the very bottom

### 2.2 — 2021-11-11

• Added ability selection of carburetor restrictors for Mini and Micro engines (RTX251730, RTX267530, RTX267535, or without any restrictors)
• Added new feature: get weather (temperature, pressure, humidity) via Bluetooth using weather stations: Kestrel DROP, Kestrel 5x00, WeatherFlow WEATHERmeter, Skywatch BL
• Added new feature: added the ability to calibrate the barometer built into your phone or tablet (go to the “Settings“ tab, then “Measurement units“)
• Added new feature: added various utilities (unit converters) (go to the “Settings“ tab, then “Utils“)
• We have improved our weather calculator significantly. Now you can manually select which type of atmospheric pressure you are working with (for example if you use portable barometers, weather stations):
- sea level pressure QNH
- sea level pressure QFF
- station pressure (barometric pressure)
• Now, if you don’t want to see intermediate (half-steps) positions for the needle, you can turn it off on the 'Engine' tab
• New type of fuels have been added: VP Racing MS93 and 93 AKI with ethanol. Please check which fuel you are using
• On the results tab, click on the drop-down menu 'Weather (AirLab)', new data for tuners are available: Air Density, Relative Air Density, Density Altitude, Station Pressure, SAE - Dyno Correction Factor, SAE - Relative Horsepower, Volumetric Content Of Oxygen, Oxygen Pressure
• In the 'Results' tab, we added recommendations about spark plug gaps, positions for idle adjustment screw, optimal water temperature, gear oil recommendations
• Improved functionality and accuracy of fuel calculator
• Bug fixes for "share setup with friends" feature
• Added new type of spark plug: NGK Rotax
• Improved functionality for the feature 'Weather for custom location'. We added a search bar where you can enter the location name. Search places easier and faster now
• We reworked the altitude determination algorithm for the 'weather for custom location' feature. We hope that now, if you manually selected your location, the altitude will be calculated with much greater accuracy
• We added the ability to leave text notes for each history in 'History' tab. To do this, open any History, enter edit mode and add a note
• Now you can manually select the translation language. Application contains many special terms and sometimes translations that we offer are not always good. We are sorry. Now, if your phone (for example) in German, but you are unhappy with the translation you can switch to English (for example) only in this app (you don't have to change locale of device). You can find this feature on 'Engine' tab at the very bottom

### 2.1 — 2021-01-22

• Added ability selection of carburetor restrictors for Mini and Micro engines (RTX251730, RTX267530, RTX267535, or without any restrictors)
• We have improved our weather calculator significantly. Now you can manually select which type of atmospheric pressure you are working with (for example if you use portable barometers, weather stations):
- sea level pressure QNH
- sea level pressure QFF
- station pressure (barometric pressure)
• Now, if you don’t want to see intermediate (half-steps) positions for the needle, you can turn it off on the 'Engine' tab
• New type of fuels have been added: VP Racing MS93 and 93 AKI with ethanol. Please check which fuel you are using
• On the results tab, click on the drop-down menu 'Weather (AirLab)', new data for tuners are available: Air Density, Relative Air Density, Density Altitude, Station Pressure, SAE - Dyno Correction Factor, SAE - Relative Horsepower, Volumetric Content Of Oxygen, Oxygen Pressure
• In the 'Results' tab, we added recommendations about spark plug gaps, positions for idle adjustment screw, optimal water temperature, gear oil recommendations
• Improved functionality and accuracy of fuel calculator
• Bug fixes for "share setup with friends" feature
• Added new type of spark plug: NGK Rotax
• Improved functionality for the feature 'Weather for custom location'. We added a search bar where you can enter the location name. Search places easier and faster now
• We reworked the altitude determination algorithm for the 'weather for custom location' feature. We hope that now, if you manually selected your location, the altitude will be calculated with much greater accuracy
• We added the ability to leave text notes for each history in 'History' tab. To do this, open any History, enter edit mode and add a note
• Now you can manually select the translation language. Application contains many special terms and sometimes translations that we offer are not always good. We are sorry. Now, if your phone (for example) in German, but you are unhappy with the translation you can switch to English (for example) only in this app (you don't have to change locale of device). You can find this feature on 'Engine' tab at the very bottom

### 2.0 — 2020-11-15

• We have improved our weather calculator significantly. Now you can manually select which type of atmospheric pressure you are working with (for example if you use portable barometers, weather stations):
- sea level pressure QNH
- sea level pressure QFF
- station pressure (barometric pressure)
• Now, if you don’t want to see intermediate (half-steps) positions for the needle, you can turn it off on the 'Engine' tab
• New type of fuels have been added: VP Racing MS93 and 93 AKI with ethanol. Please check which fuel you are using
• On the results tab, click on the drop-down menu 'Weather (AirLab)', new data for tuners are available: Air Density, Relative Air Density, Density Altitude, Station Pressure, SAE - Dyno Correction Factor, SAE - Relative Horsepower, Volumetric Content Of Oxygen, Oxygen Pressure
• In the 'Results' tab, we added recommendations about spark plug gaps, positions for idle adjustment screw, optimal water temperature, gear oil recommendations
• Improved functionality and accuracy of fuel calculator
• Bug fixes for "share setup with friends" feature
• Added new type of spark plug: NGK Rotax
• Improved functionality for the feature 'Weather for custom location'. We added a search bar where you can enter the location name. Search places easier and faster now
• We reworked the altitude determination algorithm for the 'weather for custom location' feature. We hope that now, if you manually selected your location, the altitude will be calculated with much greater accuracy
• We added the ability to leave text notes for each history in 'History' tab. To do this, open any History, enter edit mode and add a note
• Now you can manually select the translation language. Application contains many special terms and sometimes translations that we offer are not always good. We are sorry. Now, if your phone (for example) in German, but you are unhappy with the translation you can switch to English (for example) only in this app (you don't have to change locale of device). You can find this feature on 'Engine' tab at the very bottom

### 1.9 — 2020-10-11

• We have improved our weather calculator significantly. Now you can manually select which type of atmospheric pressure you are working with (for example if you use portable barometers, weather stations):
- sea level pressure QNH
- sea level pressure QFF
- station pressure (barometric pressure)
• Now, if you don’t want to see intermediate (half-steps) positions for the needle, you can turn it off on the 'Engine' tab
• New type of fuels have been added: VP Racing MS93 and 93 AKI with ethanol. Please check which fuel you are using
• On the results tab, click on the drop-down menu 'Weather (AirLab)', new data for tuners are available: Air Density, Relative Air Density, Density Altitude, Station Pressure, SAE - Dyno Correction Factor, SAE - Relative Horsepower, Volumetric Content Of Oxygen, Oxygen Pressure
• In the 'Results' tab, we added recommendations about spark plug gaps, positions for idle adjustment screw, optimal water temperature, gear oil recommendations
• Improved functionality and accuracy of fuel calculator
• Bug fixes for "share setup with friends" feature
• Added new type of spark plug: NGK Rotax
• Improved functionality for the feature 'Weather for custom location'. We added a search bar where you can enter the location name. Search places easier and faster now
• We reworked the altitude determination algorithm for the 'weather for custom location' feature. We hope that now, if you manually selected your location, the altitude will be calculated with much greater accuracy
• We added the ability to leave text notes for each history in 'History' tab. To do this, open any History, enter edit mode and add a note
• Now you can manually select the translation language. Application contains many special terms and sometimes translations that we offer are not always good. We are sorry. Now, if your phone (for example) in German, but you are unhappy with the translation you can switch to English (for example) only in this app (you don't have to change locale of device). You can find this feature on 'Engine' tab at the very bottom

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## More apps by Ballistic Solutions LLC

- [Jetting for TM KZ / ICC Kart](https://appshunter.io/ios/app/jetting-for-tm-kz-icc-kart/id1450856766)
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- [Jetting Vortex KZ1 / KZ2 Kart](https://appshunter.io/ios/app/jetting-vortex-kz1-kz2-kart/id1451631744)
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All apps by Ballistic Solutions LLC: https://appshunter.io/developer/1611909747

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*