950 Ultra XP tuning on 500"

PRH said

My expectation is...... the ootb tune will be quite rich at part throttle cruise....... and will end up lean at WOT.

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Did you look at the emulsion that carb had? That's sounds like what you see when you have a ton of emulsion. You end up with huge jets to try and keep WOT under control and cruise goes dead rich.