# Jetting CR125 Shifter Kart — CR125 jetting and logbook > Shifter kart engine jetting calculator based on weather and engine configuration. (iPhone/iPad app by ISEnet.) - Source: https://appshunter.io/ios/app/jetting-cr125-shifter-kart/id830550109 (this page in markdown: same URL + `.md`) - Developer: [ISEnet](https://appshunter.io/developer/811255764) - Category: Sports, Weather - Price: $7.99 - Rating: 4.70/5 from 22 App Store ratings · 7 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 1 MB - Languages: American English, French (France), European Spanish - Released: 2014-03-09 - Data updated: 2026-08-24 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/jetting-cr125-shifter-kart/id830550109/reviews.md ## What is Jetting CR125 Shifter Kart? Works out the jetting of Honda CR125 shifter kart engines with Keihin PWK 38 and PWM 38 carbs, from the real temperature, humidity, air pressure and altitude. ENGINES Stock Moto and Mod Moto, with a clamp-on air filter or an airbox with or without foam, and with or without a fuel pump. RESULTS The jetting recommended for the conditions and the engine you have set: main jet, needle type and clip position, and pilot jet. The main jet also comes with its real value in decimals. Plus air density, density altitude and relative horsepower. Three fine-tuning adjustments of ±10% on high, mid and low to adapt it to your engine and how it is built. The values assume a #6 slide. CONDITIONS The weather data, two ways: from the nearest public station, with how far away it is and how old the reading is, or typed in by hand. It works just the same with no signal. TRACKS 143 tracks built in, starting with the ones in the United States. Pick yours and the altitude fills in on its own: the altitude of the track itself, not of the town, which are usually different. Search by the track name or by the town. ENGINE Engine class, airbox, fuel pump, oil mix ratio and track type. LOGBOOK Saves every run with its conditions and its jetting, and afterwards you note what you actually fitted and how it went: lean, good or rich, separately for low, mid and high. Laps, best lap and maximum RPM too. It exports to CSV and moves from one phone to another. UNITS Celsius and Fahrenheit, metres and feet, and mb, hPa, mmHg and inHg for pressure. ## Key features - Jetting recommendations for Honda CR125 engines - Automatic weather data retrieval - Manual weather data input - Engine and track configuration settings - Fine-tuning adjustments for circuits - Support for multiple measurement units ## Recent user reviews (7 of 7) All indexed reviews: https://appshunter.io/ios/app/jetting-cr125-shifter-kart/id830550109/reviews.md ### 4/5 — Modified in Colorado *2019-05-11* It seems to be a bit conservative but Great ap to have for a safe starting point. ### 5/5 — Shifter racer *2017-07-25* Good basis app for starting points on jetting. All jetting is unique to conditions engines and areas but this app is very useful. ### 4/5 — Very Good Pp *2017-03-06* Gives good directional information. My motors run leaner than the recommendations in the app, but the changes driven by atmospheric conditions are very good. ### 5/5 — Ignore my previous negative review *2016-11-17* Ignore the negative review. I see what he's doing. It's the corrected altitude which is what is used for jettting anyway. Will test and see how it works. ### 5/5 — Best jetting app *2016-07-20* I've been using this app for a couple of months now. I tested it out at Phoenix and El Paso, TX. So far, the jetting parameters are spot on. They tend to run on the rich side, which is always ideal for these expensive engines. I do run them at 1.5 richer just to be on the safe side as competition is more about the driver not the engine out here in El Paso with the Border Karting Association ### 5/5 — Shifter kart racer *2016-05-26* This app is good. But I just upgraded to a gravity feed fuel system. I do not know how this app is going to work out because it does not have the gfs on their applications. ### 5/5 — great tool *2015-10-16* This is a great product to give you a baseline to work from without the complex weather tools. Really helpful when weather changes too or when your kart has been in stored away for a few months. Great product for the price, much cheaper than a new top end. ## Frequently asked questions about Jetting CR125 Shifter Kart ### What is Jetting CR125 Shifter Kart used for? Jetting CR125 Shifter Kart provides jetting recommendations for Stock Moto / Mod Moto shifter karts with Honda CR125 engines. It calculates optimal main jet, needle, and pilot jet settings based on current weather conditions and engine configuration. ### How does Jetting CR125 Shifter Kart get weather data? The app can automatically obtain weather data (temperature, pressure, humidity) from the nearest weather station using your device's location services and internet connection. Alternatively, you can manually input these values. ### Can I customize jetting settings in Jetting CR125 Shifter Kart? Yes, the app allows for fine-tuning adjustments to the main, needle, and pilot circuits. These customized values are stored for future sessions, helping you adapt to your specific engine and track. ### What engine and track configurations can Jetting CR125 Shifter Kart handle? Jetting CR125 Shifter Kart supports Stock Moto and Mod Moto classes, various air filter types, fuel feed systems, oil mix ratios, and circuit types (spring or road racing, short or long). ### Does Jetting CR125 Shifter Kart support different measurement units? Yes, the application supports multiple measurement units for temperature (°C, °F), altitude (meters, feet), and pressure (mb, hPa, mmHg, inHg, atm) to accommodate users worldwide. ### What is the price of Jetting CR125 Shifter Kart? Jetting CR125 Shifter Kart is a paid application priced at $7.99. ### How often is Jetting CR125 Shifter Kart updated? The app was last updated on October 17, 2023, with version 1.5. This indicates a history of maintenance and potential improvements. ### What devices is Jetting CR125 Shifter Kart compatible with? Jetting CR125 Shifter Kart is available for iPhone, iPad, and iPod devices, and has an age rating of 4+. ## Version history (last 5 releases) ### 2.0 — 2026-08-21 Version 2.0 LOGBOOK Saves every run with its conditions and its jetting, and afterwards you note what you actually fitted and how it went, separately for low, mid and high. With laps, best lap and maximum RPM. Exports to CSV. TRACKS 143 tracks built in, the ones in the United States first. Pick yours and the altitude fills in on its own: the altitude of the track, not of the town. CONDITIONS The weather station data and the values you type in, on a single screen. No more going back and forth between two tabs. FIXED • The position screen did not work: the system had stopped reporting the position years ago. • The app was drawn cropped on modern iPhones. • The values on Weather ran off the right edge of the screen. • Fine tuning was left written into the calculation table. • Usage data no longer leaves the device. ### 1.5 — 2023-10-17 Minor adjustment in the calculation model after testing on the dynamometer. ### 1.4 — 2016-04-25 This app has been updated by Apple to display the Apple Watch app icon. Improved service for obtaining weather information. Minor changes in user interface. ### 1.3.1 — 2015-10-23 Fixed display bug and network access error in iOS9. ### 1.3 — 2015-08-01 Fixed issue in GPS functionality. ## Apps similar to Jetting CR125 Shifter Kart | App | Rating | Price | Category | | --- | --- | --- | --- | | [DER Racing Series](https://appshunter.io/ios/app/der-racing-series/id6446979470) | — | Free | Sports | | [Broou surf forecast & reports](https://appshunter.io/ios/app/broou-surf-forecast-and-reports/id861018000) | 4.4 (17) | Free | Sports | | [Lazy Surfer](https://appshunter.io/ios/app/lazy-surfer/id1450887020) | 4.7 (499) | Free | Sports | | [Blood Tracker for Deer Hunting - Deer Hunting App](https://appshunter.io/ios/app/blood-tracker-for-deer-hunting-deer-hunting-app/id1180340540) | 2.0 (2) | $2.99 | Sports | | [Jetting IAME SWIFT & GAZELLE](https://appshunter.io/ios/app/jetting-iame-swift-and-gazelle/id1530716139) | 3.7 (3) | $7.99 | Sports | | [World Racing League](https://appshunter.io/ios/app/world-racing-league/id1499615717) | 3.3 (8) | Free | Sports | ## More apps by ISEnet - [Jetting Max Kart for Rotax Max](https://appshunter.io/ios/app/jetting-max-kart-for-rotax-max/id811255761) - [Jetting TM Kart for KZ / ICC](https://appshunter.io/ios/app/jetting-tm-kart-for-kz-icc/id825656147) - [Jetting for KTM 2T Dirt Bikes](https://appshunter.io/ios/app/jetting-for-ktm-2t-dirt-bikes/id836693590) - [Air Density & RAD meter PRO](https://appshunter.io/ios/app/air-density-and-rad-meter-pro/id838893833) - [Kart Chassis Setup](https://appshunter.io/ios/app/kart-chassis-setup/id885032175) All apps by ISEnet: https://appshunter.io/developer/811255764 ## Related topics [jetting for ktm 2t dirt bikes](https://appshunter.io/ios/topics/jetting-for-ktm-2t-dirt-bikes) · [alfan](https://appshunter.io/ios/topics/alfan) --- *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 2026-08-24.*