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Adopted this bike for a while and it rips. But it also doesn't want to stay running. Starts up OK when cold with choke, but after a couple minutes of warming up just feels like it wants to die. Pretty sure the exhaust is aftermarket/shorty and apparently the "carbs were done" but who knows what. It's leaking a little black oil from the exhaust header and pipe, lots of white smoke, makes me think it's running super rich.
I don't know much about 2 strokes, is that normal? What's typical for warming up - I've heard you shouldn't idle for long. Haven't tinkered with it much yet but any tips on where to start would be cool.