10 hr johnson 1954

redsrider

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May 29, 2012
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I have a 10 horse johnson. Can you tell me the correct spark pulg to use?
 

nwcove

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May 16, 2011
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Re: 10 hr johnson 1954

champion j6c or j4c. do not cross reference to ngk or other brands.
 

JB

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Re: 10 hr johnson 1954

What nwcove said. Gap plugs at .030"
 

1946Zephyr

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Oct 21, 2008
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Re: 10 hr johnson 1954

I would use J6C only. J4C just doesn't let the motors perform as well.
 
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