Quote:
Originally Posted by tomsninja2020
are #108 main jets going to be to lean for here in Minnesota. Elevation is 1,158' In my 150 scooter I run #125 but that is a gy6 150 engine so not sure how much difference that makes. I just don't want to have to chase jet sizes till I find the right one that works.
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Usually the opposite. Elevation has less air-density, so mixtures tend to be too rich. General rule of thumb is lean out mixtures by 2% for each 1000ft altitude.
Also you got Keihin jets right? Other brands may have #108, but they are actually different hole diameter.