Lynn, Trying to fix any kind of a problem while frustrated can be, well, more frustrating. I feel for you.
Being thorough and methodical is the way to find out what is going on. Once finally figured out, you can make informed decision about wether to fix or not. Sometimes, it just not worth it.
You keep saying "spitting back through carb"
This sounds like backfiring. Most discussions with you about this problem assume that is what 's happening. If something else is happening, you need to identify it correctly to figure out what is going on.
With that being said In your first post here
https://forums.yesterdaystractors.com/viewtopic.php?t=1429877
several things were mentioned, but I don't believe responded to:
In reply to "deanostoybox"
Perhaps crossfire due to leaky spark plug wires or crack/carbon track in distributor cap?
you stated
deano, the wires are new - not that that means they are good! I replaced the dist cap w/an old one & it seemed to run better but I can see nothing wrong w/the new one I took off. Need to pull it outside so I can run it w/out breathing fumes but it's supposed to rain all day & half the night. Gives me something to do tomorrow!
Thanks!
I don't believe we heard anymore about this from you. You did say
it seemed to run better but I can see nothing wrong w/the new one I took off
Problems are not always visual. If they were, boy this stuff would be easier.
So did this resolve the spitting or not, when you say it seemed to run better?
Then "soaked" asked:
Hi Lynn, Is the clip still under your rotor? Sometimes they lift off with the rotor, and end up on the floor.
Never heard a reply here.
Then in what is the currently last post in that thread I reponded to you saying
This '50 runs weird. It starts easily, runs smooth, then spits back thru the carb. Maybe once, maybe several times, then smooths out, then spit, then smooth, etc, etc, etc,..... It sounds like a valve sticks open
I had the covers off & could see no problem. The spitting is very irregular
I said
A valve sticking occasionally would be very difficult to see on a running engine.
I'd try cleaning/lubricating all the valve stems. Maybe spraying each with PB Blaster, or the like, for a few days.
Did you try lubricating the valve stems thoroughly?
Then in your next post
https://forums.yesterdaystractors.com/viewtopic.php?t=1430339
about this
"Den N Ms" said
Lynn Patrick,Do a compression test on all 4 cylinders.Check valve clearances as you could have a burnt/leaking intake valve or one that is to tight causing it to backfire in the intake manifold.I don't think anything is wrong with your carburetor.
You responded by saying
Den, thanks for the input. Not to argue, just to learn, but if a valve was leaking or too tight wouldn't it fire back every time? This is very irregular.
Valves can stick irregularly.
"Den N Ms" & "Gaspump" replied with information about leaking / sticking valves. You said
I appreciate all the responses, but am still wondering how a valve can stick so irregularly & only when opening the throttle, even very slightly??? Again, not arguing, & will do a compression check as suggested
Again, valves can stick irregularly when dirty, gummed up, or for other reasons. Have you done the compression test?
Now in this current thread from "Jim L WA"
(quoted from post at 12:59:25 05/18/20)
(quoted from post at 15:36:34 05/18/20) Sticking valves? Weak valve springs?
Thanks for the responses. What I don't understand is the connection between opening the throttle & a valve sticking????
Again, Again, valves can stick irregularly.
I think before we can give any more help, what we need to do is determine if valves are sticking or not. Previous idea's mentioned to you will help you to figure this out.