Re:Farmall 300 gas backfire

cuby · Jan 24, 2020

Thanks all for your replies. I went wit cap, rotor, plug wires first and same thing. Then I installed points and cond. Now it performs as it should. My last experience with a bad cond. was that it just failed and the engine would not run. Hope I can remember this if I have another problem the same.
Again, Thanks to All

Dave H (MI) · Jan 24, 2020

I have a clipboard in the shop for each tractor/major piece of equipment. I fill out a service record form I made on the 'puter when I do work. I attach to it copies of any forum posts I made with responses I used to help me do the work. This is all on the clipboard. I have more stuff than I can remember how to fix...this helps.

ih560 · Jan 24, 2020

Speaking of this kind of crap, I put a set of New Champions in my 450 a few weeks ago. They were new never used, but I have had them a few years. The tractor ran fine that day, but I only moved it out of the garage and then put it back after doing some cleaning. I go to start the tractor a couple of days later and it starts right up but starts missing, popping and cracking not very long after. I thought for sure something stopped up the carburetor. I went through all the normal troubleshooting and isolated it to the #2 cylinder by removing the plug wires one at a time. I put one of the old plugs back in it and it ran perfectly again. The plug is complete crap, it will not spark consistently. I bought a new set of Autolite plugs to install and everything has been fine. The old plugs that were in the tractor were many years old and were performing fine, but it was time to replace them.
It sad to say, but you can get some new parts that aren't even good.

rustyfarmall · Jan 25, 2020

(quoted from post at 14:06:20 01/24/20) Speaking of this kind of crap, I put a set of New Champions in my 450 a few weeks ago. They were new never used, but I have had them a few years. The tractor ran fine that day, but I only moved it out of the garage and then put it back after doing some cleaning. I go to start the tractor a couple of days later and it starts right up but starts missing, popping and cracking not very long after. I thought for sure something stopped up the carburetor. I went through all the normal troubleshooting and isolated it to the #2 cylinder by removing the plug wires one at a time. I put one of the old plugs back in it and it ran perfectly again. The plug is complete crap, it will not spark consistently. I bought a new set of Autolite plugs to install and everything has been fine. The old plugs that were in the tractor were many years old and were performing fine, but it was time to replace them.
It sad to say, but you can get some new parts that aren't even good.

My experience with Champion plugs is similar, except I had one brand new plug that was bad right out of the box. Nothing wrong that I could see. It simply would not fire.

Re:Farmall 300 gas backfire

cuby

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Dave H (MI)

Well-known Member

ih560

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rustyfarmall

Well-known Member

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