Re: stock tank gas to oil?
I ride a Stella (Indian Vespa) with a Piaggio 200cc engine and tranny. I have a bottle for oil that, when you squeeze it measures out an amount of oil to be added to the gas tank. The oil bottle lives in my scooter's glove box. Sta-Bil comes in a bottle like that as does Craftsman chain saw oil.
Many years ago I had a Sears moped (Puch). One time I put the oil in first and it did go right to the carb. It took me a while to get that all sorted out. Should have put the gas in first.