You should be able to rejet that stock Keihen clone carb. Remove the stock main jet. Note the number. Install the next higher number jet. They usually go up five numbers to the next size jet.
I have not rejetted a 250, but I have rejetted a 125cc mill with a Keihen clone carb.
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Last edited by wheelbender6; 01-02-2021 at 10:22 PM.
Reason: Spelin
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