Spark plugs on a 35hp Johnson Super Seahorse

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flyfishtoday

Recruit
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May 27, 2010
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2
Hi all,

I am looking for the brand of spark plugs and proper plug gap for my 64 model super sea horse outboard 35 h.p.

Thanks for your help.
 
lindy46

lindy46

Captain
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Nov 27, 2008
Messages
3,886
Re: Spark plugs on a 35hp Johnson Super Seahorse

The last year of the 35hp models was 1959. You must have a 40hp if it is a '64. Use Champion J6C plugs gapped to .030".
 
F

flyfishtoday

Recruit
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May 27, 2010
Messages
2
Re: Spark plugs on a 35hp Johnson Super Seahorse

The motor cover says it is a 35 H.P ,but the boat title says it is 64
Would the plugs and gap be the same?

Thanks
 
cougar1985

cougar1985

Lieutenant Junior Grade
Joined
Oct 7, 2005
Messages
1,023
Re: Spark plugs on a 35hp Johnson Super Seahorse

.020 and .030 cover omc motors for many many years..020 being points gap and .030 being the plug gap.boat title .numbers etc mean didlly squat for the engine as it could of been changed a hundred times by now .look for a rectangular metal plate on the motor transom bracket or the number off of a metal welch plug on the motor proper.post results.
 
R

R.Johnson

Rear Admiral
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Sep 24, 2003
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4,446
Re: Spark plugs on a 35hp Johnson Super Seahorse

The proper plug is a J4C.
 
glassmaster68

glassmaster68

Petty Officer 1st Class
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Feb 17, 2010
Messages
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Re: Spark plugs on a 35hp Johnson Super Seahorse

yeah,i have j4j which was later changed to a j4c,,,,,,,j4c,,,,.030 gap
 
samo_ott

samo_ott

Vice Admiral
Joined
Jun 18, 2006
Messages
5,125
Re: Spark plugs on a 35hp Johnson Super Seahorse

You might have a 33hp but they didn't make a 35hp in the 60's. as mentioned, look for the model number on the transom plate. The plugs are pretty much the same though.
 
R

R.Johnson

Rear Admiral
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Sep 24, 2003
Messages
4,446
Re: Spark plugs on a 35hp Johnson Super Seahorse

Most model's from about 1958 on, and with conventional magneto ignition, and equiped with a thermostat used J4C gapped at .030.
 
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