Antique Johnson Motor

[Tom Ca]

Does anyone know how I can get a shop or owners manual for a Johnson Seahorse Motor. This thing looks real old but is in good shape with good compression.<br /><br />I think it is Model # HS 10 with Serial #841145.<br /><br />Also, is there any chance that things like air clearners, spark plugs etc. are still available?

 

[Paul Moir]

Re: Antique Johnson Motor

HS-10 is a 1940 2.5hp engine. It has a 4.08 cubic inch displacement and makes it's power at 4000 rpm. Spark plugs are originally Champion J8J, which has been replaced with the easily found Champion J8C. I believe the plug gap is .030". Outboards don't have air-cleaners, so you don't have to worry about that. Although it's not often a problem, you can get a new water pump ring from grove.net/~noff/marx.html .<br /><br />Reprints of the original factory manuals can be had from kencook.com theoutboardwizard.com maxrules.com and marineengine.com .<br /><br />Hope that helps!

 

[CATransplant]

Re: Antique Johnson Motor

That's a 1940 2.5 hp outboard. Parts are going to be pretty scarce for that one. No air cleaner was fitted. <br /><br />You might want to check with www.aomci.org<br /><br />They're an antique outboard club, and have info on ways to deal with these older outboards.<br /><br />The good news is that if you have compression and spark, you can probably get this little eggbeater running again pretty easily.

 

[CATransplant]

Re: Antique Johnson Motor

Double post...sorry.

 

[Chinewalker]

Re: Antique Johnson Motor

Hi Tom,<br /> A well set-up HA-10 will just about start itself. That family of motors was well designed and included the 2.5 and 5hp models of the late 1930s to the late 1940s.. I had one of the 5hp models with an open flywheel - I could start that one without a rope giving it a flick of the wrist and it would kick off! VERY smooth runner and idled beautifully!<br /><br />- Scott