Guys I need some advice please. I bought a TW200 from a friend not sure of year. The gasket at the dino leaked so I got a new one and fixed it up this morning. Cleaned the filters and drained the old oil. I then filled with the 1liter of oil and went for a drive. Coming home I checked and saw the oil level has droped below the sight glass. Opened the air filter and the oil just poured out. About the 1liter I put in Came out. What can be the cause of this?