Hi there vic 18, I just come across an 18 that was my grandfathers, it has the round choke assembly but the hose is short, the patent number is 41427/58. I'm not sure if it's the same as yours but would be interested to know. I'm new to this as well but think I got the 18 bug too.The engine number is A1 4739 and on the lower crank case there is a 4, is yours similar?
Brett
