Posted by Letterman on January 16, 2011 at 02:47:14 from (208.74.247.249):
I have a Farmall Super M. It's always ran well. We've been having severe cold weather, so I originally suspected some ice in the gas. I've put in 4 containers of HEET in the last few weeks. The problem just wont go away. Even when we had on a few warmer days (above freezing).
Here's what it's doing. It starts fine, choke is fully closed. As soon as it starts I open the choke slightly and it runs great. But after a minute or so it begins to spit and sputter. loses power, and on occasion shoots a flame out of the muffler. Going up a hill or any load, such as pushing snow with the loader makes it worse. The longer it runs the worse it gets, and just to keep it running I have to fully close the choke, and keep it closed. It will stay running that way, but if I try to push any amount of snow, or a round bale, it struggles to stay running. At this point, if I open the choke, it shuts right off.
If I shut it off, and let it rest for a few minutes, it will once again run well for a minute and then repeat this all over again. It most definitely seems to act like it's running out of gas, more than an electrical issue, but I wont rule out anything. I am not low on gas. I have not tried to adjust the carburetor, because it does run well when I start it, and was running well prior to this issue (and I dont recall what screws to adjust either). The bowl is filled with gas even after it begins to run poorly.
One thing I am also noticing is that the top part of the carburetor and lower end of intake manifold become encased with frost on the outside after it runs for awhile. I was told this is normal, but I never noticed it in the past, but at the same time, I dont normally look at the carb when the tractor is running well.
What could be the cause of this? I should mention that on occasion it will run perfectly fine for 10 or more minutes, but the next time I use it, the problem returns. I'm puzzled, and it's too cold outside to start ripping everything apart not knowing the exact cause, other than it's most likely fuel related.
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