1979 Johnson 70 HP Sea Horse

marcusknight

marcusknight

Petty Officer 2nd Class
Joined
Mar 5, 2010
Messages
156
I have owned a 1979 Johnson 70 HP Sea Horse for several years now, but I have never been able to get an impression of the reputation of this type of engine. Mine seems to be in great condition. Any of you want to weigh in on how good or not so good this particular engine is? Any maintenance specifics I should watch out for? Prop recommendations? 100_5472.jpg
 
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durban

Master Chief Petty Officer
Joined
May 27, 2011
Messages
894
Re: 1979 Johnson 70 HP Sea Horse

Iam a big fan of these motors have a collection from 1970 to 1984 if yours is used in salt water , watch out for the salt build ,as they are well known to get water in to the ports i have done some improvement & modifications to these motors .
http://forums.iboats.com/showthread.php?t=528873
 
marcusknight

marcusknight

Petty Officer 2nd Class
Joined
Mar 5, 2010
Messages
156
Re: 1979 Johnson 70 HP Sea Horse

Nope, always kept in fresh water. Runs great. Starts up in less then five seconds every time.
 
D

durban

Master Chief Petty Officer
Joined
May 27, 2011
Messages
894
Re: 1979 Johnson 70 HP Sea Horse

i normally mix just a little extra oil with my fuel about 115ml to 5lts , it does no harm very important , i always say rather a little extra oil then not enough
 
Chinewalker

Chinewalker

Fleet Admiral
Joined
Aug 19, 2001
Messages
8,902
Re: 1979 Johnson 70 HP Sea Horse

marcusknight said:
Mine seems to be in great condition. Any of you want to weigh in on how good or not so good this particular engine is? Any maintenance specifics I should watch out for? Prop recommendations?[/ATTACH]
Click to expand...

One of the best designs ever! I have had several 3-holers over the years, and still have my 1980 75hp. Solid design, great on fuel, good parts availability, runs like a banshee, and they sound cool, too!

MAintenance - do a decarb - poke around on iboats for specifics.

Prop - set it up to peak in the high 5000 RPM range. I like to aim for about 5800 RPM. Anything less than 5400 or so is lugging it and will kill it over time.
 
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