I've mentioned it here before but these things can get missed. Just for curiosity I did some tests starting with fresh fuel and gradually adding water to see what would happen. At 3% water the engine still ran exactly as it did with the fresh fuel and I flew it as well. None of this wimpy test stand stuff But at 4% water all the oil suddenly settled to the bottom of the tank. Now with the clunk at the bottom of the tank the engine found it hard to even pop with 100% oil going through the carb

This is why I simply can't believe that 20% water article, CL engine or not.