Farmall md spark plug gap

Don't remember the correct gap right at the moment, but do yourself a favor and get the right plugs before you go any further. Old Champion number is D89D, new number, 543. They're salty, maybe approaching $10 a throw, but well worth it. Brillman has them, but my last several sets were bought from NAPA, who got them next-day for about the same price. You'll be glad you did.
 
Checked this out before somewhat. Owners manual for a M lists .020 to .025, SMD .020, 400D .023. MD used a magneto and a distributor would be standard on the others unless a mag was wanted.
 
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