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You would need to reduce the amount of fuel to match the reduced amount of oxygen in the warmer air, but make sure it doesn't get too lean.
Maybe the venturi effect would do that by itself because the air would be thinner?
Or maybe it would appear to be running rich?
Do carbs have to be adjusted to feed less fuel for higher altitudes? If they do, then the same thing might apply.
I've never tried it or seen it tried...
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