Sometimes when a bike sits, the floats get corroded and stick and sometimes they stick open allowing fuel to overfill the carburetor, if the intake is open when parked, the fuel will run right into the combustion chamber, pass by the piston rings and into the cranckcase.
I saw this happen serveral times.
Check your oil level and its probably overfilled, but its a gas and oil mixture so do not just drain out enough oil to the correct level, drain all the oil and change the oil filter.
Now you'll also have to pull the carburetor and have in thouroughly cleaned, jets removed and soaked, rinsed and blown through with compressed air.
After your carbs are cleaned and a new oil change your bike will be good to go.
Some people prefer to use seafoam added to their gasoline, to help prevent the floats from sticking and the jets clogging.
If possible it is also helpful to start the bike at least weekly and let it warm up to temp.
especially if you plan not to ride it for a while. If you fear that the gas will run into the motor again from sitting, be sure to turn the fuel petcock to off.
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