Jetting for Rotax Max EVO Kart

Version 2.6 • Apple Watch, widgets and Live Activity: your main jet for right now on your wrist, on the lock screen and in the Dynamic Island throughout your track day. • Track mode: your jetting large and high contrast, to read it in full sun with your helmet on. • Alerts when the weather changes enough to change the main jet or the needle: "Air density has risen by 1.6 % since your last calculation. The main jet stays at 125; the needle goes to clip 4". • Fuel: 98 E5, E10, ethanol-free or race fuel, and the jetting is corrected for it. • Carburettor icing warning, using the criterion of civil aviation. • 144 tracks, and when you fetch the weather the app detects which one you are at. • Logbook synced through iCloud, and your jetting shared with your mechanic as a link or a QR code. • Location also works on iPad without GPS and indoors, and reporting a problem is one tap away from Results. The calculation coefficients do not change: with 98 E5, the usual fuel, the result is the same as before. IN EARLIER VERSIONS • 2.5: fuel and oil mix calculator, and a refreshed icon. • 2.4: track logbook with self-calibration; Micro and Mini by spec (MY20) instead of by year; the two neighbouring jets; sharing as an image; Conditions on a single screen; new interface with dark mode and six more languages. • 2.3: the app renewed for iOS 26, with engine years up to the current one and 0 °C no longer read as 25.

Main jet, needle position and spark plug for your Rotax Max EVO — Micro MAX, Mini MAX, Junior, Senior, DD2 and Supermax — worked out from the real temperature, humidity, pressure and altitude, and from the fuel you use. WHY THIS APP • Apple Watch app, widgets and Live Activity: your main jet for right now on your wrist, on the lock screen and in the Dynamic Island. • It alerts you when the weather changes enough to change the main jet or the needle, also from the hourly forecast. • Track mode: your jetting large and high contrast, to read it in full sun with your helmet on. • A logbook that learns from your engine: if it always wants a little more or a little less, the app spots it and suggests it. • It takes the fuel into account: 98 E5, E10, ethanol-free or race fuel. • Carburettor icing warning, using the criterion of civil aviation. • 144 tracks in 22 countries with the altitude of the track itself, and it detects which one you are at. • Logbook synced through iCloud, and your jetting shared with your mechanic as a link or a QR code, no accounts. RESULTS The recommended main jet in large type, with the exact value and the two jets it falls between: green when the choice is clear and amber when it sits halfway. Also the K57 needle position, spark plug, air density, density altitude and relative horsepower. High and mid fine tuning go in steps of 0.1 and show what each step does. FUEL 98 E5, E10, ethanol-free, leaded race fuel, E10 race fuel, oxygenated, or your own with its stoichiometric ratio and density. With E10 the main jet goes up by about 1 % and the needle by more than half a position compared with 98 E5. CARBURETTOR ICING From the temperature, the humidity and the chart civil aviation uses for carburettor engines, the app warns you when there is a risk at full throttle, and Conditions tells you whether there is one at idle and on the grid. TRACK MODE AND TRACK DAY Your jetting full screen at maximum brightness, and how much the density has changed since what you fitted. When you start a track day, for 12 hours the main jet is on the lock screen, in the Dynamic Island and on Apple Watch, and the app watches the weather for you. Dark mode throughout. CONDITIONS From the nearest weather station or typed in by hand; with no coverage it works just the same. If you are at a track on the list, the app detects it and asks whether that's the one. ENGINE AND MIX Class, model year or spec (for Micro and Mini, standard or MY20, because the MY20 kit can be retrofitted), spark plug, float height, airbox, oil percentage and type, fuel and track type. Fuel and oil calculator in litres, millilitres, gallons and ounces, as a percentage and as 1:n. LOGBOOK Each session with its conditions and jetting, and then what you actually fitted and how it went — lean, right or rich — at low, mid and high, with laps, best lap and max RPM. Synced through iCloud across your devices and exported to CSV. SHARING As an image card, a link or a QR code: your mechanic opens it in their app or, without it, in the browser. UP TO DATE WITH THE RULES The app follows the Global RMC Technical Regulation: Dell'Orto VHSB 34 XS carburettor, K57 needle, 4.0 gr floats and DP267 needle jet. UNITS °C and °F; metres and feet; mb, hPa, mmHg and inHg; kg/m³, lb/ft³ and lb/gal. PRIVACY No trackers and no personal data. Your location is only used to query the weather station and the forecast. In thirteen languages. NOT VALID for Rotax Max engines from before 2015: for those, Jetting Max Kart.