WD spark plugs

jerkus730 · Jan 23, 2023

What is the correct spark plugs for a magneto WD?

old · Jan 23, 2023

I run NGK3112 in my WD45 and have had very good luck with them so they should be fine in your WD

Skyhighballoon(MO) · Jan 24, 2023

I thought the older short cylinder heads on the WD's took 3/8 reach plugs and the taller heads on the WD45 and D17's took 3/4 reach plugs.

DrAllis · Jan 24, 2023

After the last 50 or 60 years, who knows. From the factory, 3/8" reach spark plugs were used on all WD45's and early D-17's prior to chassis s/n 24001. Any D-17 after that and all 170-175's were always 3/4" reach plugs. HOWEVER, if you replaced a tall cylinder head with a new one from A-C, you were given the newest head, which meant 3/4" reach plugs. So, one must look over the depth of the threads if there's a question.

jerkus730 · Jan 24, 2023

It's the stock head, I was told it should have non resistor plugs. I don't even know if that is correct.

old · Jan 24, 2023

With a mag you don't want resister type plugs.

WD spark plugs

jerkus730

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old

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Skyhighballoon(MO)

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DrAllis

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jerkus730

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old

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