Mine has done the same thing, but I had the gas on. I know that it is from having the drain tube plugged but I thought that if you turned the gas off it would not flow in. I guess the only way to stop it is to take the plug out and turn the gas off. Did it hurt anything with it being in your oil or did you find it before you ran it?
There is still gas in the lines when you shut off the fuel valve. I try and shut my fuel off and let the bike idle for a minute to burn some off the gas in the line. There is enough gas trapped to let the bike idle for a couple minutes.
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