Fuel is clear and will sit on top of oil and the dipstick is shiny, You think it's possible the fuel was way up the stick and all you seen was the dark oil near the bottom ?
That's the only way I can think of for fuel/oil mixture to enter the breather system, It's very common for carbs to flood and fill the cylinder. Fuel is so thin it runs right past the ring end gaps into the crankcase, If the exhaust valve isn't fully seated fuel will run into the muffler as well.
Sounds like your on the right track, Clean carb and change oil..... But....Keep a eye on it because cleaning sometimes doesn't solve the issue, It may take a new float needle valve assembly.....
Originally Posted by piston slapper
You never learn anything until you admit you don't know it all...
"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!