Posted by sb1980 on January 28, 2016 at 07:26:04 from (24.181.20.225):
Hey guys. I'm new to the forums, and new to tractors. I recently purchased a 1957 Ford 640, and I'm having a little issue with it and haven't found much help. Was hoping someone here may be able to offer some advice.
The tractor will fire up immediately and run great after starting up. I notice it slowly starting to run worse as it warms up though. Runs great for first 15 or so minutes, then it slowly starts idling worse and almost sounds like it's skipping/sputtering. At this time, I can actually pull the choke for about 3 or 4 seconds, and push it back in and it'll clear up, maybe for about 5 minutes. Then around the 30-40 minute mark of working, it actually sounds like a lawn mower when it's running low on gas, and will even shut off. Sometimes I can get it to crank back up immediately (still sputters like it's out of gas), sometimes it needs to cool down before it will crank back up. If I let it cool down for about 15 minutes, I can fire it right back up, and work on it for a while before it's starts acting like it's needing gas again.
We have replaced the gas tank (old one was rusty), rebuilt the carb, new plugs/wires, new points, new condenser, and new resistor.
It's a 12v conversion.
Any thoughts or ideas?
I'm new to tractors, but have a few friends who are trying to help me resolve this issue.
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