Spark Plugs for 1948 Cub

Florida Tom · Jul 8, 2008

Can anyone tell me what spark plugs I should put in my Cub? And what gap? Oh yea, do the regular Parts Houses carry them?

Thanks as always.

Bigdog · Jul 8, 2008

Champion D-15's or equivalent for working tractors. D-21's or equivalent for non-working tractors. Gap is .023" to .025". Plugs are available nearly anywhere.

Haas · Jul 8, 2008

Unless the engine is in very good shape, the D-15 plugs will foul pretty quick unless you are working the tractor very hard. I think the D-21 plugs are the best choice.

Gale Roberts · Jul 8, 2008

I have a 1948 Cub with a Woods 59 Inch Belly Mower which I mow with every week for 4 or 5 hours steady. (I mow several Acres) I have Champion D-18Y spark plugs in it and it runs great and the spark plugs last for years without fouling or burning up. I buy them at the local Blains Farm & Fleet store......Gale

Spark Plugs for 1948 Cub

Florida Tom

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Bigdog

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Haas

Well-known Member

Gale Roberts

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