gas fouling # 4 plug

I have a 1941 Farmall H I have overhauled carburator
and put in a new kit. It ran ok for a while but now
as soon as it warms up the #4 plug gets flooded out.
Gas is turned down as far as possible. Replaced the
plug and checked the wire. Can you help me on this?
 
Maybe some wear or something different about that cylinder. Maybe you can fix the problem with a hotter plug - what are you currently running? Is the rest of the electrical system good - wires, points, etc.
 
My Farmall B was fouling on #3 under load. I switched from Champions to Autolite 3116s on recommendation from the knowledgable people here. I don't know if that is the right plug for an H but it is a hotter plug and took care of my problems.
 
Thanks Charlie. yes to your electrical questions and I tryed going from the Autolite 3116 to the champion and I was told by Napa that there where no hotter plugs then the both of these. Where they correct?
 
It may be oil fouling not gasoline.
If compression is good I would put umbrella style valve seals on it (easy to do W/o taking off the head by putting a foot of cotton rope in the cylinder then running the piston up against the closed valves by hand to keep them up. Jim
 
Check for buildup on the inside of the distributer cap. I replaced the cap once on a Farmall B, it ran great for awhile, then missed like crazy. It took a long time to find the problem because the cap was new. The buildup looked like the buildup you get on a plug, but not black, it was whitish. I scraped that off, and no problems since.
 
The problem is not the gas you probably have a bad wire or maybe the valves in that cycl arent set correct. You can also take that plug and replace from another cycl that would also tell you if the plug was bad but gas is not the problem. How does that plug look when it quits firing good like other post says maybe a bad cap. But if you change plugs from another cycl that will prove the problem is the wire or bad set on the valves. BTDT with other used tractor ive boughttill i found the problem. Just do one thing at a time so you can find the problem.
 
my W-6 plugs fouled, because prev owner would't warm up enough, changeds to hotter plug and let warmed up... since you say it happens after it warms up, maybe the valve stems is letting oil in,,, going to be intersteing to find out why...
 
I have an M that will do that on #4 also. I always wondered if it had something to do with the fact that #4 plug wire was on the bottom and either had a bit of water allowing the spark to get away or the distributer was sore and #4 took the hit. Mine will do it if I use the choke too soon, but it is always #4, even after I changed plugs, wires, cap, rotor, points, checked the valves, compression, and valve seals. If you find out what the problem is let me know. :)
 
(quoted from post at 16:17:27 05/01/13) I have a 1941 Farmall H I have overhauled carburator
and put in a new kit. It ran ok for a while but now
as soon as it warms up the #4 plug gets flooded out.
Gas is turned down as far as possible. Replaced the
plug and checked the wire. Can you help me on this?

So what is the compression on #4?
 
Run hotter plugs and put an anti-fouler on that cylinder. My grain truck does the same thing when it is cold. Once it builds enough heat up that cylinder chimes in and she purrs right along.
 
Thanks for replying. it's not oil it is for sure gas that's flooding out the plug. I'v got the hottest plug in avaiable. It has a strong spark, but something happens after in runs for a little while.
 

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