Posted by Peter M Fallert on September 25, 2023 at 12:37:19 from (136.143.157.161):
I have recently purchased a 1955 John Deere 40-C crawler.
I'm trying to adjust the carb. The high speed load jet adjustment seems to be working, but the idle speed is mysterious.
No matter what I do , it seems to not have any effect on how the tractor idles. when I rotate the speed handle all the way to the left to idle position the tractor dies.
I've had the carb apart and it was clean as whistle inside, all passages clear. I've read in two place now that screwing the idle screw in richens, and screwing it out leans. Is the screw/needle an air bleed? Advice please. Thank you, Peter
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