Buy the needle valve, nut, and packing and replace it. I used the one that is called for in the 656 carb found at caseih.com in the search for parts. Just like any other jet open it at least 3 turns and up to 5 turns if you run wide open a lot.
My 2606 had the original solenoid that also had a jet adjusting screw. They don't sell them anymore. The guts of the solenoid didn't work and was gone and prior owners just put an oring around the solenoid and screwed it in and out like a jet. But it leaked some.
I've run mine for hours and runoff problems. Probably more of issue with plowing all day and shutting them off when hot.
Any engine needs to be idled for a while anyway if ran hard for a long time.
Besides, you don't want to leave it with gas in the carb anyway especially with the gas they sell now. Put a quarter turn valve in the fuel line. When I'm done for the day, I turn the valve and let it run out of gas. Then I have to remember to go turn the key off but I pull it out any way so it won't be too easy to steal or have someone borrow or joyride it.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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