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Jim -- you say it wants to hunt just a little. Are you saying the tractor throttles to maintain idle rpm? If so, throttling is a sign of a blocked IDLE passageway. You mentioned you cleaned the idle port. I am not so sure this statement has meaning. The idle path in those carburetors will have several segments, and if any of them is blocked, the end result is the same. Take a look in on the site listed below. Whence there, click on carburetors and wait for the PDF document to load. The entire document is very educational, but I point you in particular to the no-wrench test of the LOAD and IDLE pathways on the document's page 7. I also say this -- with that vintage JD-A, there is a tendancy to hunt as you say it. John Deere never bragged in their sales literature how well a tractor would idle, but rather how well it would pull! During IDLE, there can be a difference in the fuel-air mix going to No.1 and No.2 cyclinder bores. And this is phenomenon is somewaht aggravated if the engine has some other minor deficiencies such as low compression, or gasket leakage between the carburetor and manifold. Lots to consider here -- but the gist of this message is to run the LOAD & IDLE passageway tests so that you at least know you aren't faced with a carburetor blockage issue. The repair you mentioned should be okay so long as the needle will perform its measuring function. (PatB)
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