I want to use the oil tank as a secondary fuel tank and was wondering what the easiest way is to do this? And diameters of the fuel lines would be handy as well so I can order in the right parts from the local motorcycle shop. I wouldn't mind having a petcock for the secondary line as well. Any help would be much appreciated :) At the moment I have capped the oil tank and oil pump inlet (which I will loop after reading a post on this forum) and am premixing. She's running beautifully (although I could reduce the oil/petrol ratio a bit).