Reserve tanks DO exist on motorcycles, but I have never seen one in China Girl gas tanks on motorised bicycles...lol.Super effective yet remarkably simple engineering of solution to a real-world problem. I'd eat my hat if they don't exist......A reserve tank...that I would like to see!
It's not really a separate tank either, it is just a lower "bulge" area that is built into the gas tank where the petcock resides is all it is where that bottom hole on the petcock tube would be able to suck up the gas from the bottom of the tank is all it really is...The China Girl gas tank do not have this bottom of the tank "bulge" built into them.