Re: Zenith rebuilt. No power past 40mph
If I understand you correctly, you have two carbs; one runs great, the other runs great below 40, but gives you trouble above 40. If that is correct, it would suggest that the problem is not ignition. If is was, you would experience the problem with both carbs.
I would agree that the likely culprit is a problem jet. I would suggest this... swap out the jets from the 'good' carb to the 'bad' carb. If that solves the problem, it would confirm that it is one or more bad jets.
If you do buy new jets, I agree with Mitch, get the ones from Renner.
Good luck,
Ken
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