m one banger

kub6040

Well-known Member
I have a JD m that has a lazy cylinder and seems to gas foul the plug. The carb isn't correct but it doesn't seem to affect both plugs. What would y'all check first, second I need help.
 
I have a 430, which has similar 2 cylinder. My carb had issues and usually the number 1 plug would foul. I got some relief from shutting the fuel off when I stopped it, but for some reason mostly #1 would foul. I was told once that it is the way the manifold is set up. Best bet is to rebuild carb but you might bet by a while using one of the gizmos that go under the plug, you find them at NAPA and just set the plug out a bit. I use Autolite 237 plugs in mine and they seem to work well.
 
Try putting another sealing washer from an old plug on a new plug so there is 2 sealing washer. This will help from fouling plugs.
 
How about a little history. 6v or 12v? How old are the points, plugs, and wires? Solid wires? What plug are you using? Point gap, plug gap, timing?

One of mine used to do that and it was nothing more than it hated the Champions. Autolite 216's cured it.
 

The "Lead" Cylinder (the one that fires first), while at idle and no load, GETS the majority of the Fuel mixture, while the "Trailing" cylinder get less intake
fuel/Air mixture and loafs..and with light loads or Idling a little "Rich" will Foul the Training cylinder's Sparkplug..

Ron,,
 
I file about 1/32" off the end of the rotor.
Takes a little hotter spark to jump the gap, and thus a hotter spark at the plug.

No scientific data, just my experience.
 

I would check to see if both cylinders have the same or close compression.
If both are close -+/- 5 pounds or so - I would then get a different brand of plugs and try them.
That failing I would then put a hotter plug in the fouling cylinder and a cooler plug in the other.
Maybe even use a different brand of plug in each cylinder.
Lastly - I would get another tractor!
 
Blaming Champion spark plugs seems to be the "in" thing to do, just like blaming ethanol.
 

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