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Yes, you have a blocked IDLE passageway. Two things here, the model of carburetor you have and the trouble the carburetor has. You can learn more about both issues at the JD-H Restoration Site (below). Once at the site, under the heading ARTICLES 1, one-click on the drop-down that reads CARBURETORS. This is a 9-page piece on JD natural draft single barrel DLTX models of carburetors. There's theory and troubleshooting, and on page nine is a two part, no-wrench test you can perform on your carb to individually verify openness (or the lack of it) of the passage ways for IDLE and for LOAD. Returning to the website mentioned, and under ARTICLES 1, one-click on the drop-down CARB ID CHART. There you will be able to identify the model of carburetor your tractor left the factory with. Judging from what you have reported, I would venture to say you have a segment or two in the IDLE path that is blocked. The usual methods of "boiling" the carburetor clean with solvent will not work on 60+ year old cast iron carburetors -- why? The passageways become closed due to rust, and the solvents will not remove rust. The "community" generally uses what is known as aircraft drill bits -- long bits and you must use the precise size for your carburetor! Oversize any of the orifices and you have permanently altered the carb and its usefullness could be terminated! What is a man to do? There is a reputable outfit known as Robert's Carb Repair, and they will counsel with you, sell you the RIGHT sized drill bits, and also sell you a video on overhauling your carb -- something along this line is a must if this is your first JD carb and you intend to do the work yourself. You can learn more at their website (www)(dot)(robertscarbrepair)(dot)(com). (PatB)
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