Jetting for Honda CR 2T

This app provides, using temperature, altitude, humidity, atmospheric pressure and oil-mix ratio, a recommendation about the jetting configuration to use for Honda CR 2-stroke motocross bikes (CR80, CR85, CR125, CR250 and CR500), from 1986 to the last two-strokes Honda built, in 2007.

Every recommendation starts from the reference setup for that model and model year, and is corrected by the air density of your conditions. It is not a rule of thumb from a forum: it is a starting point worked out for the day in front of you.

In order to get the weather values, the application can use the location service (GPS or WiFi) to obtain the position and altitude, and the network connection to get the temperature, pressure and humidity from the nearest weather station. Nevertheless, the application can run without GPS, WiFi and internet connection, in this case, the user has to give the weather data.

What you get:
- Main jet, needle type and clip position, slow jet and air screw, calculated from the air density for your conditions, in the sizes that actually exist for your carburettor -Keihin PE and PJ, Mikuni TMX-.
- Weather from the nearest station in one tap, or typed in by hand when there is no coverage.
- A logbook of your rides: what the app recommended, what you actually fitted, and how it ran, rated separately for the low, mid and high circuits. Export as CSV or move it to another phone.
- Fine tuning to adapt the recommendation to your own engine.
- Air density and density altitude, always on screen.

The app lets you use different measure units: ºC and ºF for temperatures, meters and feet for altitude, mb, hPa, mmHg and inHg for pressures, and kg/m³, lb/ft³ and lb/gal (US) for air density.

No ads, no tracking, no account. Every calculation runs on your device, so the app works at the track with no coverage: you only need a connection if you want to pull the weather from the nearest station.

Valid for the following models:
- CR80: 1995-2002.
- CR85: 2003-2007.
- CR125: 1986-2007.
- CR250: 1986-2007.
- CR500: 1986-2001.
* Please note that the application is valid only for the carburetted two-stroke CR. It does not cover the four-stroke CRF.