Posted by T.R.K. on May 31, 2022 at 19:03:24 from (173.185.105.200):
In Reply to: Farmall m backfire posted by Noah Washine on May 30, 2022 at 19:16:21:
The others have good ideas.
It is sounding like you are getting fire into the intake manifold while a valve is still open.
What type ignition is on your M? If you have converted to electronic ignition, they can screw up their timing sometimes.
The first thing I would check is the rotor button still turning? Years ago I had one do that on another make tractor and the fiber gear in the magneto has stripped out and was loose on its shaft. So it might be a good idea to see if you can actually turn the rotor button on the shaft (In a distribuitor you should be able to turn it a few degrees because of the mechanical advance, but it shouldn't just be turning freely in there.)
If I prove that to not be the case then I would check the valves. Also, if a valve or valve seat suddenly becomes damaged it can do that same thing too. I had one once with water damage from sitting and a few minutes into running a piece out of one of the valve seats.
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