I seen the neighborhood kids mix two stroke oil and gas by the color of the gas. Then soon after I explain what a ratio cup is and give them the cost on a rebuild. The bike had straight gas in it. It was so hot I had play in the new crankbearings. The internal flywheel hit the stator ripping the screws in the case.
I mixed my older husky saws with the oil at 2.3, suggested mix on the bottle was 2.5. A tad rich on oil.