I have a 1988 johnson 4hp, what spark plugs do you use and what should they be gapped at
G goose master Cadet Joined Sep 5, 2005 Messages 10 Oct 7, 2005 #1 I have a 1988 johnson 4hp, what spark plugs do you use and what should they be gapped at
B BoatBuoy Rear Admiral Joined May 29, 2004 Messages 4,856 Oct 7, 2005 #2 Re: 4hp johnson ,spark plugs Champion QL77JC4 gapped at .030.
