Re: 1936 Johnson A-80 4.5 hp Spark Plugs?

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RICHARD A. WHITE

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#67156

The Old Outboard Book Volume 3 shows a 5MJ originally gapped at .03, That plug in the same book was replaced with a D9J

So did some searching and found this:

http://www.sparkplug-crossreference.com … AMP_PN/D9J

http://www.richardsoutboardtools.com
classicomctools@gmail.com