A few years ago my '37 JT started running bad, had to use the choke just to keep it running. So I put in the shed, drained the gas. So, the last couple of evenings I took the carb off, soaked and blew it out good, flushed out the tank as I see the intake is above the bottom of the tank. I got it going, ran alright, but started hard. This morning I could not get it started, cranking by hand and pulling. I had spark. and gas to the carb. I took out a plug, looked old.( I am sure they were decades old) I called NAPA to see if they still made W-14 plugs, he had four in stock (at $10 each) That was a surprise! I put them in and gave the crank a tug and it fired right up. Now it needs a good wash.