Paul with respect it appears that you have no kmowledge of the functionality of Jettec Pro in that the whole pont of setting and matching the s/w parameters to suit your particular carb motor combinations with the facility for multiple combinations each having their own set of parameters. Put simply if you set up the software based on the conditions and motor combinations corectly in the first place, the laws of physics will not change like the weather, therefore the correct air fuel ratio can be quickly established whatever happens to the climatic conditions. Might I sugest that you take a close look at the system should you get the chance and I am sure that you will change your opinion.
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