560 stalling problem

Hello Everyone, This is my first post to this website. I'm scratching my head on a 560 problem.I believe it is either a fuel problem or an air problem. Here's what's happening. Upon starting, the tractor runs great. I hook up to a stalk chopper or disc or anything and put it under a load. For the first 30 minutes or so, it runs and pulls just fine, but after running and getting warmed up good, it starts spitting, sputtering and finally dies. If I let it cool off for a while, I can go out and start over and it will do the same thing. I've changed carburators, put new intake and exhaust gaskets on, new plugs, wires, and pretty much about all I can think of. I'm wondering if I'm not ready for a valve job. The tractor has 3850 hours on it. Anybody have thoughts on my problem. Thanks in advance.
 
Check your flow of gas to the carb . check and make sure that the main fuel adjusting screw is 4-5 turns off the seat check ing timing at full throttle and it should be 24-26 degrees BTDC . Also use at least 89 octain on that engine .would run better on 93 .
 
Yep I know exactly what it is. Fly in the gas tank. Shut fuel valve on sedimant bowl. Take glass bowl off. Find a piece of rubber hose to slip over valve. Open valve and blow air backword into tank with your mouth. Shut valve. Spit out fowl taste. Reinstall glass. Open valve and go to work. Carry the rubber hose with you at all times because if you have it handy and can fix in field it may not happen again for 2 yrs. but if you go to field without it, it will happen tomorrow. Do not spend any time with flashlite looking in tank trying to find whatever is plugging because you will never see anything, but it is in there. You know this has to be a real answer because no one could make this up. I told this in a lite hearted fashion but I am dead serious about this. The Flying Belgian.
 
Well, I believe I've tried everything now. Took sediment bowl off and blew air through a hose. Checked the timing. By the book it says it should be at 30 degrees at full throttle. Took care of that. Boy, it sure sounds nice running. Went back out to mow pasture, and it fell flat on it's face about 2 minutes after engaging pto. I've had it. Tomorrow I'm calling the IH dealer to come and get this dang thing and fix it. It's useless to me the way it is. Thanks for the help guys.
 

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