Oldfeller--FSO
Serious Thumper ModSquad
   
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Hobby is now "concentrated neuropany"
Posts: 12686
Fayetteville, NC
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Oil doesn't bubble, but gasoline in oil can make a bubble sound as it boils out in the bathtub area (bathtub area gets quite hot when you first shut the engine down as it is directly over the piston crown and the cooling air flow has stopped).
What sort of petcock system do you use?
This has happened before -- bad petcock let gas into carb during shut down which made it into the oil by weeping down the cylinder wall.
This is bad for the oil and bad for the cylinder and piston.
Open your oil adder port by turning the cap off and kneel down and sniff the freshly opened hole (engine must be hot to generate the fumes) -- do you smell gasoline?
If so you have things you must do -- get the oil changed asap and fix or replace your petcock to stop more gas from getting in there.
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