sputtering goo

I wanted to lean out the bottom slightly on my 2001 kx250.I went 1 size smaller than stock on the pilot.when I rode it last it sputtered black goo all over the bike.I have never had a bike do this before.is this usually not from a rich condition?I put it back to stock and it's all good now.I touched nothing else.I know this carb has tps so could it have been stuck or inop and it was a fluke and I rattled it loose when I rejetted back to stock?

My old 125 did that all the time. After every ride I'd have oil all over the swingarm and silencer. It's probably running rich.

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