Spark plugs for my Johnson

[boatingbob]

I need to know what kind of plugs I should put in my 1962 Johnson 40 hp. The plugs in it are Champion J-4J and according to the computer at Canadian Tire there is no such plug. I need help. Thanks.

 

[rickdb1boat]

Re: Spark plugs for my Johnson

J4C gapped at .030...

http://www.boatsetup.com/SparkPlugChart.pdf ] Click Here [/url]

 

[ezeke]

Re: Spark plugs for my Johnson

Sometimes that spark plug link does not work, but if you copy this one to your browser without the quotation marks, it almost always will.

"http://www.boatsetup.com/SparkPlugChart.pdf"

 

[rickdb1boat]

Re: Spark plugs for my Johnson

Thanks Ezeke. That's a little easier and shows the whole page without having to flip....I'm gonna change the bookmark...

 

[boatingbob]

Re: Spark plugs for my Johnson

Thanks Ezeke. That's a little easier and shows the whole page without having to flip....I'm gonna change the bookmark...

Does it have to be a Champion plug like can I use NGK B7S plugs?

 

[rickdb1boat]

Re: Spark plugs for my Johnson

Definitely use Champions if possible. They perform much better in OMC products...