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So your mixture setting is rich and you're sputtering when cold, but it all disappears when warm. Could your setting be too rich for your own good? I'm just guessing here so don't yell at me JW.
My guess is that the combination of your rich setting and the WUR's compensation for cold operating condition is causing your problem. I run my 3.0 motor rich (the garage and I smell like it when I'm done playing), but not too rich.
With a 3MM allen wrench try turning the mixture screw counterclockwise an 1/8 of a turn and see if that doesn't fix your problem. Of course a gas analyzer is the only what to do it correctly (had to say it before someone got on me for my bad habits...yes, I carry around a 3MM allen wrench).
Good Luck.
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