Champion Spark Plug No.

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trice
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Champion Spark Plug No.

Postby trice » Mon Nov 25, 2019 9:10 pm

Howdy!
I would like to verify the Champion plug no. for a 1950 Cub with 6V magneto is a D16??, thx.

tst
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Re: Champion Spark Plug No.

Postby tst » Mon Nov 25, 2019 9:45 pm

yes and you can use up to a D21, a little hotter plug

JohnMihevic
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Re: Champion Spark Plug No.

Postby JohnMihevic » Tue Nov 26, 2019 5:14 am

I've used both the D16 and D21. I prefer the D21. The plug stays cleaner with a nice tan color. The D16 is a black color with more carbon build up. I have a '48 cub with magneto and 6V system.

John M.

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radioguy41
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Re: Champion Spark Plug No.

Postby radioguy41 » Tue Nov 26, 2019 8:51 am

JohnMihevic wrote:I've used both the D16 and D21. I prefer the D21. The plug stays cleaner with a nice tan color. The D16 is a black color with more carbon build up. I have a '48 cub with magneto and 6V system.

John M.

Same here, I prefer the D21 plugs.

Larry
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Gary Dotson
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Re: Champion Spark Plug No.

Postby Gary Dotson » Tue Nov 26, 2019 9:16 am

Spark plug heat range is use dependent. A Cub spinning a 5 ft. mower on a hot summer day will likely be happier with the D-16, a parade tractor or a Cub plowing snow on a cold winter day, will likely run better with the D-21. There are also colder D-15Y and in the middle, D-18Y. Choose accordingly.

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radioguy41
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Location: Lehighton, PA

Re: Champion Spark Plug No.

Postby radioguy41 » Tue Nov 26, 2019 4:16 pm

Very true. Another factor might be whether it burns oil or not. If it burns oil then you're going to want a hotter plug to reduce the chance of fouling.
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