ASO keywords
Most repeated terms in the listing. Highlighted ones also appear in the title.
main jet11jetting11jet10weather8main7air density6density6carburettor5day5change5air5slow jet5jet pilot5pilot screw5fuel4track4full4honda crf3jet needle3needle clip3clip position3position slow3weather changes3models crf150r3
What's new in 1.6
The biggest update of the app: logbook, track mode, your fuel, widgets, Apple Watch, alerts and iCloud.
• Jetting logbook: save each ride and note what you actually fitted and how it went. Export to CSV or share a copy.
• The weather station, now inside Conditions, with location that also works on an iPad without GPS.
• Fuel: choose 98 E5, E10, E15, ethanol-free, leaded or oxygenated race fuel, VP U4.4 or your own values, and the jetting is corrected for it. The Engine tab tells you what it does to the main jet.
• Carburettor icing warning, from temperature and humidity; on the CRF250X, read as an enduro bike.
• Track mode: the jetting full screen, huge and in high contrast, with the screen always on and at full brightness. From there you start a track day and show your mechanic a QR code.
• Widgets, Lock Screen, Live Activity and Apple Watch, with complications.
• Alerts when the weather changes enough to change the main jet.
• Share the jetting with your mechanic with a link, a QR code or a file.
• The logbook and your settings sync through iCloud.
• 2025 and 2026 CRF150R.
• Dark mode, a new launch screen, the help rewritten and a redesigned More Apps screen.
• Fixes: better translated labels in German, French, Italian, Portuguese and Russian, and the nearest part is picked correctly at both ends of each list.
IN EARLIER VERSIONS
• 1.5: the CRF150R up to 2024.
This version requires iOS 15 or later.
Released Feb 22, 2015. Current version shipped Oct 14, 2026.
Store description
Jetting for Honda CRF 4T works out the carburettor settings for the conditions of the day: main jet, needle, clip position, slow jet and pilot screw.
Tell it the bike and the weather, and it gives you the jetting. If you would rather not type the weather in, the app brings it from the nearest weather station.
WHY THIS APP
• The only Honda CRF jetting app with Apple Watch, widgets and alerts when the weather changes.
• 4 models, CRF150R to CRF450R, from 2002 to 2026: each year with its own carburettor and parts.
• It jets for YOUR fuel: 98 E5, E10, E15, ethanol-free, leaded or oxygenated race fuel, VP U4.4 for four-strokes, or your own values.
• Track mode: main jet, needle, clip, slow jet and pilot screw huge and in high contrast, to read in full sun with your helmet on.
• Widgets, Lock Screen, Live Activity and Apple Watch: the jetting of the moment without opening the app.
• It warns you when the weather changes enough to change the main jet, and when there is a risk of carburettor icing.
• Share the jetting with your mechanic with a link or a QR code, and keep your logbook in sync through iCloud.
WHAT IT DOES
• Full jetting: main jet with the exact calculated value below it, needle type, clip position, slow jet and pilot screw turns from fully closed.
• Weather from the nearest station in one tap: temperature, pressure and humidity, plus altitude from the GPS.
• Logbook: save each ride, then note what you actually fitted and how it went, rated per circuit -low, mid and high-, because jetting can run rich down low and lean up top at the same time. Export to CSV, or share a copy to move it to another phone. The logbook and your settings sync between your devices through iCloud.
• Fine tuning: shift the recommendation to suit your engine, between -10 and +10. Every engine has its own character, and wear, the exhaust or the filter change it.
• Air density and density altitude, the intermediate result everything comes from and a quick way to compare one day with another.
• Fuel: the jetting is corrected for the one you use, and the Engine tab tells you what it does to the main jet. Octane does not change the jetting; ethanol does.
• Carburettor icing: a warning under the fine tuning when there is a risk, and the dew point in Conditions.
TRACK MODE
From Results, the sun button puts the jetting full screen, big, with the screen always on and at full brightness. It shows how much the air density has changed since what you have fitted, how old the data is, the conditions, your fuel and the icing warning. From there you start a track day and show your mechanic a QR code.
ALERTS
During a track day the app keeps an eye on the weather and tells you when it changes enough to change the main jet: "Air density has dropped 1.8 % since your last calculation: the main jet goes from 180 to 178." With the hourly forecast it can also tell you ahead of time. Forecast alerts always arrive; the others depend on iOS.
UNITS
• Temperature: °C and °F
• Pressure: mb, hPa, mmHg and inHg
• Altitude: m and ft
• Air density: kg/m³, lb/ft³ and lb/gal (US)
No ads, no tracking, no account. It works with no signal: enter the weather by hand and the calculation is the same.
MODELS
CRF150R (2007-2026), CRF250R (2004-2009), CRF250X (2004-2019), CRF450R (2002-2008)
The carburettor is not a choice: the year and model determine it, according to Honda's manual for that year. Valid for carburetted engines only.
The values are a starting reference. Air temperature and density change through the day, and so does the right jetting.
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