Posted by Steve@Advance on August 21, 2016 at 18:57:47 from (107.203.134.67):
In Reply to: Farmall A diesels posted by Flyby on August 21, 2016 at 15:45:02:
If slowing the idle down didn't stop it, an easy way to determine if it's still getting spark is to turn the ignition off, pull the coil wire, see if that stops it. If so the switch is not killing the power (if battery ignition) or providing the kill ground (if magneto). Either case, look for corrosion on the back of the ignition switch.
If pulling the coil wire doesn't stop it, it's not running hot, and slowing the idle, and checking the timing didn't fix it, could be the cylinders are carboned to the point it is running on heat, compression, and glowing carbon. Only sure way to clean it is to pull the head, scrape it out.
Personally, unless it's detonating (clattering under load) I would just kill it with the clutch.
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