# Jetting for Honda CRF 4T Moto — for 150R, 250R, 250X 450X 450R > Motorcycle carburetor tuning and spark plug recommendation tool for Honda CRF 4T. (iPhone/iPad app by Ballistic Solutions LLC.) - Source: https://appshunter.io/ios/app/jetting-for-honda-crf-4t-moto/id1473590491 (this page in markdown: same URL + `.md`) - Developer: [Ballistic Solutions LLC](https://appshunter.io/developer/1611909747) - Category: Sports, Utilities - Price: $5.99 - Rating: 4.40/5 from 7 App Store ratings · 8 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 39 MB - Languages: American English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French (France), German (Germany) and 22 more - Released: 2019-08-03 - Data updated: 2026-09-01 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/jetting-for-honda-crf-4t-moto/id1473590491/reviews.md ## What is Jetting for Honda CRF 4T Moto? 2002-2021 models This app provides, using temperature, altitude, humidity, atmospheric pressure and your engine configuration and fuel type, a recommendation about best jetting (carburetor configuration) and spark plug to use for Honda 4-strokes MX bikes (CRF-R and CRF-X models) with Keihin FCR carburetors. 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. If more accuracy is needed, a portable weather station can also be used. Application can run without GPS, WiFi and internet, in this case user has to give the weather data manually. • For each carburetor configuration, the following values are given: main jet, needle type, needle position, pilot jet, air screw position, spark plug • 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 (gasoline with or without ethanol, Racing fuels available, for example: VP Racing T4, U4.4, MR12, Sunoco 260 GT Plus, EX02) • Adjustable fuel/oil ratio • 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, the carburetor setups 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 Valid for the following models from 2002 to 2021: • CRF150R • CRF250R • CRF250X • CRF450R • CRF450X The application contains four tabs, which are described next: • Results: In this tab main jet, needle type, needle position, pilot jet, air screw position, spark plug are shown. These data are calculated depending on the weather conditions and the engine configuration given in the next tabs. This tab lets do a fine tuning adjustment for all this values 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, volumetric content of oxygen, oxygen pressure are shown too. On this tab, you can also share your settings with your colleagues, or add settings to your favorites. You can also see in a graphic form the calculated ratio of air and fuel (lambda). • History: This tab contains the history of all carburetor setups. If you change the weather, or engine setup, or fine tuning, the new setup will be saved in history. This tab also contains your favorite settings. • Engine: You can configure in this screen the information about the engine, that is, engine model, year, spark manufacturer, fuel type, oil mix ratio. • 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 (you can choose one weather data source from several possible) to get the weather conditions of the nearest weather station (temperature, pressure and humidity). In addition, this application 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. Also, on this tab, you can manually select any place in the world, the carburetor setups will be adapted for this place. Moreover, on this tab, you can enable alerts about possible carburetor icing. 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 - Carburetor jetting recommendations - Spark plug selection - Automatic weather data integration - Manual weather data input - Fuel type selection - Jetting setup history - Air/fuel ratio graphing ## Chart rankings - #193 in Top Paid · Sports (US App Store) ## Recent user reviews (8 of 8) All indexed reviews: https://appshunter.io/ios/app/jetting-for-honda-crf-4t-moto/id1473590491/reviews.md ### 4/5 — Email address *2025-05-06* Jetting Crf 4t ### 3/5 — No CRF 230 *2020-10-28* Very detailed and great looking app. If it had the CRF 230 engine, would have definitely gave 5 stars ### 5/5 — Good *2019-12-19* Best jetting app for motocross bikes ### 5/5 — Рекомендую *2019-09-14* Приложение предлагает всегда отличную карбюрацию, экономит кучу времени и помогает снять пару десятых ### 5/5 — Good *2019-08-24* Easy to use and very valuable information... ### 5/5 — Must have *2019-08-20* Easy to use and very valuable information ### 5/5 — Good *2019-08-09* This app save for me and my team a lot of time. Best jetting app for Honda 4t. ### 5/5 — Super *2019-08-08* Easy and save a lot of time for me and for my team. Very valuable info. Super! Must have ## Frequently asked questions about Jetting for Honda CRF 4T Moto ### What Honda CRF 4T models does Jetting support? Jetting supports Honda CRF150R, CRF250R, CRF250X, CRF450R, and CRF450X models manufactured between 2002 and 2021. ### How does Jetting get weather data? Jetting can automatically obtain weather data from the nearest weather station via the internet using GPS. It can also use an internal barometer on supported devices or accept manual input from a portable weather station or user entry. ### Can I use Jetting without an internet connection? Yes, Jetting can run without GPS, WiFi, or internet. In this mode, you will need to manually input the current weather data (temperature, altitude, humidity, atmospheric pressure). ### What specific carburetor settings does Jetting recommend? Jetting provides recommendations for main jet, needle type, needle position, pilot jet, air screw position, and spark plug. It also allows for fine-tuning of these values. ### Does Jetting offer different fuel type options? Yes, Jetting supports selectable fuel types including gasoline with or without ethanol, and various racing fuels like VP Racing T4, U4.4, MR12, Sunoco 260 GT Plus, and EX02. ### How can I track my previous carburetor setups with Jetting? Jetting features a History tab where all your carburetor setups are saved. This includes new setups saved when you change weather, engine configuration, or fine-tuning adjustments. You can also save favorite settings here. ### What units of measurement does Jetting support? Jetting supports various units of measurement, including ºC and ºF for temperature, meters and feet for altitude, liters, ml, gallons, and oz for fuel, and mb, hPa, mmHg, inHg, and atm for pressure. ### Is Jetting suitable for all users, or is it for advanced mechanics? While Jetting provides detailed technical information, its user-friendly interface and automatic data fetching make it accessible for enthusiasts looking to optimize their bike's performance. The fine-tuning options cater to those seeking advanced adjustments. ## Version history (last 5 releases) ### 1.8 — 2025-01-26 • New type of fuels have been added: VP Racing C12, VP Racing 110, VP Racing MRX02 • 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) • 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 • 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 added new fuels, this is gasoline with ethanol. It require a richer carburation than regular premium gasoline • Improved functionality and accuracy of fuel calculator • Bug fixes for 'share setup with friends' feature • Fixes for showing 'Carburetor icing alert', now it doesn't overlap other content • 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 ### 1.7 — 2021-11-10 • New type of fuels have been added: VP Racing C12, VP Racing 110, VP Racing MRX02 • 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) • 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 • 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 added new fuels, this is gasoline with ethanol. It require a richer carburation than regular premium gasoline • Improved functionality and accuracy of fuel calculator • Bug fixes for 'share setup with friends' feature • Fixes for showing 'Carburetor icing alert', now it doesn't overlap other content • 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 ### 1.6 — 2021-11-07 • New type of fuels have been added: VP Racing C12, VP Racing 110, VP Racing MRX02 • 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) • 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 • 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 added new fuels, this is gasoline with ethanol. It require a richer carburation than regular premium gasoline • Improved functionality and accuracy of fuel calculator • Bug fixes for 'share setup with friends' feature • Fixes for showing 'Carburetor icing alert', now it doesn't overlap other content • 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 ### 1.5 — 2020-12-02 • 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) • 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 'Weather' tab at the very bottom ### 1.4 — 2020-10-28 • 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) • 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). 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User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-01.*