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1973 IH 766 chokes out when trying to throttle it up.

C

ChrisB2

New User
I have a 1973 IH 766. It starts fine, but when I want to throttle it up, it wants to kill almost like if I pull the choke out. I have replaced the points, plugs, wires, spark plugs, and even checked the fuel filter. I can normally throttle it up very slowly, but if I put any load on it while it is cold it will try to choke out. The interesting thing is once the tractor gets warmed up, most of this problem goes away. Does anyone have any ideas how to fix this issue?
 
1) Gas, or Diesel?
2) Have You checked the Air Filter?
3) What Air Temerature at startup?

My Dad bought a IH - 666 gas new. I can remember even new that he griped about how cold nature it was to start. I dont think it ever started below 18 degrees without a booster/charger on the battery. At or below freezing it miss fired terribly for several minutes till warm. & You didnt dare put it in gear within 1 minute of startup! Even in low gear letting off the clutch slowly would kill the motor even at 15 - 1800 rpm. We also had a JD 60 2 cyl. If You kept a good set of batterys in it. It would start at 10 degrees, & below, & would move withourt killing the motor within a few seconds of startup. We fed a lot square bales of hay on the coldest days; because it had no 3pt hitch to move round bales. Dad still has the IH though! Scotty
 
Well, the only thing you haven't touched is the carburetor...

I'll give you three guesses where the problem is.

Get a rebuild kit. Tear it down. Clean it out. Put it back together and adjust it per the specifications in the book.
 
If runs OK after it warms up, it is the nature of it. We have an old 656 at our farm that was bought new when I was a little kid. It has always been "cold-natured" and then runs like a champ after it warms up. Put a heat-houser on it for cold weather use, it will make it run better.
 
I had that problem with a 666 I got last year. Replaced the everything you mentioned plus the coil and rebuilt the carburator. All of that helped incrementally, but there was still something wrong. Ended up burning the points again which led me to the condensor. Replaced that and it has performed great since.
 
Thank you for your reply. I have also had the carburator rebuilt, new condensor, and new coil put on. The points look OK.
 
Thank you for your reply. I do not think I have ever looked at your suggested items. Are you referring to the valve on the exhaust manafold? If this is it, the spring is intact and the valve is free.
 
Thank you for your reply. I used my Dad's IH 560 gas for years and it always ran great even in the coldest weather. I hoped the performance on this IH 766 would be similar.
 
Thank you for your reply. I forgot to mention that I had the carburator rebuilt as well. Do you know where I can find what the adjustments should be for this rig so I can compare against what it is currently set at.
 
Thank you for your reply. It is a 766 Gas. It seems to give the same choking out problems until it warms up in the summer or the winter. I checked and blew out the air filter a while back. I ran a JD 620 for years and it would start no matter how cold it was. Interestly, it never choked out when I put it work. Any other ideas?
 
Be sure your dwell is in spec,the valves are adjusted,and the timing is correct.I then will drill out the main fuel jet 1 or 2 sizes bigger.The gas anymore just doesn't seem to have the zip it use to.
 
Are you sure its choking out and not starving for fuel? Do you get Black smoke when you try to advance the throttle? I would sooner think its starving for fuel. But I could be wrong. If it is
starving, Open the Main jet a little at a time til
it improves. Adjust the idle jet til it idles good.
 
Thank you for your reply. It acts more like its starving for fuel. It doesn't seem to smoke. Would this problem solve itself as the tractor warms up? I will check the settings on my carburator.
 
Thank you for your reply. What do you mean by make sure your dwell is in spec? I do seem to have as much trouble when I have fresh fuel in the tractor.
 
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