I have a 10 horse johnson. Can you tell me the correct spark pulg to use?
R redsrider Cadet Joined May 29, 2012 Messages 12 Jul 14, 2012 #1 I have a 10 horse johnson. Can you tell me the correct spark pulg to use?
nwcove Admiral Joined May 16, 2011 Messages 6,293 Jul 14, 2012 #2 Re: 10 hr johnson 1954 champion j6c or j4c. do not cross reference to ngk or other brands.
JB Honorary Moderator Emeritus Joined Mar 25, 2001 Messages 45,907 Jul 14, 2012 #3 Re: 10 hr johnson 1954 What nwcove said. Gap plugs at .030"
1946Zephyr Vice Admiral Joined Oct 21, 2008 Messages 5,556 Jul 14, 2012 #4 Re: 10 hr johnson 1954 I would use J6C only. J4C just doesn't let the motors perform as well.
