No you will not damage the engine by going too lean, it will simply have no go and pop under hard acceleration. Being jetted wrongly either 1 or 2 jets too rich or too lean will just result in poor performance/lap time. There is only one setting and that is the correct one! Establishing the correct jetting to enable the software to be set up correctly in the first place is the key. It is a bit like having a clock that is set slightly too fast or too slow it will ALWAYS be wrong. If you simply chose a jet setting at random you may well be spot on one day just like a stopped clock is absolutely correct twice a day! Unless you understand the process involved and diligently test and monitoring the air density to record the data accurately then set the parameters within the software your software will always be wrong.
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