How much oil do you put in a 49cc mini motorcycle?

Well the first necessary piece of information I would need to know is: Is it a two stroke or four stroke engine? I assume its four stroke as I'm sure you know that you need to mix two stroke oil with petrol and then put it in the tank if it's a two stroke. In that case, 25 to 30ml of two stroke oil to a litre of petrol is perfect. On the otherhand, if it is a four stroke, 300-400 ml of oil should be about right.