Restoring a 1966 Johnson 6hp Seahorse

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emsfire138

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Aug 15, 2003
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I am restoring a 1966 Seahorse 6hp. It has a plastic 2-blade prop on it now. I'd like to replace it with an aluminum prop. Should I try to find a 3-blade?? What pitch would be best for this size motor? Also, has anyone found any good place to get replacement hood decals?<br />**Curious...what is the difference between the newer 6hp and 8 hp Johnsons? All specs (bore/stroke/displacement, etc.) are the same. Is the only difference in the carbs? (Same for 9.9s and 15s, I guess). Just wondering.....
 
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Paul Moir

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Nov 5, 2002
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Re: Restoring a 1966 Johnson 6hp Seahorse

The engine originally came with a 8 x 7 1/4, 2 bladed aluminum prop. Apparently, no other props were offered.<br /> Picture.<br />Information.<br />From the Old OMC Site. <br /><br />Sorry, I don't know the difference between the 8 and 6. I expect you'll find exhaust tuning and rpms contribute though. Mabey even the ignition (spark advance).<br />Good luck with the restoration!
 
rolmops

rolmops

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Re: Restoring a 1966 Johnson 6hp Seahorse

Hello.<br />For propellers:<br />boat length:14' to 16' 7 1/4x6 1/2 Light Load Michigan 012068<br /> 14'to 16'All Loads 8 1/4x8 omc 387334 or Mi.012008<br />14 to 16 runabout 8 1/4x9 omc 39534,Mi 012101<br />12 to 14 light load 8x7 1/4 omc 376988,Mi. 012005<br />12 to 14 light load 8 1/4x 8 1/2 omc 377635,Mi.012007.<br />Sorry, I can't find the decal website right now,probably steel spike or chinewalker can fill you in.
 
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emsfire138

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Aug 15, 2003
Messages
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Re: Restoring a 1966 Johnson 6hp Seahorse

Thanks for the info...I was able to locate the decals. This motor will primarily be used on a 12ft. fishing boat (very light). I found a 3-blade 81/4 X 81/2 prop on this site. This should work out pretty good for this combo, I would assume. Another quick question, though. I have another Johnson O/B (mid 80's 15hp.). The gas tank for this motor was stored for quite a while, and has alot of moisture and corrosion inside. Is there anything that I can use to clean it out? It doesn't even want to prime up when I pump the bulb - probably junk in the pick-up. Any suggestions?
 
rolmops

rolmops

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Re: Restoring a 1966 Johnson 6hp Seahorse

Hello.<br />Empty the old gas out and if you can take the pickup out and clean thoroughly.Take a handful of roofing nails and dump 'em in the tank add maybe a pint of fresh gas. Close the tank and then, shake the living daylights out of it.Repeat this a few times.This should help you get rid of loose corroded pieces.<br />Clean and rinse with gas and then reinstall your pickup.<br />Good luck.
 
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emsfire138

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Aug 15, 2003
Messages
8
Re: Restoring a 1966 Johnson 6hp Seahorse

Thanks for the suggestion...I'll give that a shot.
 
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Solittle

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Apr 28, 2002
Messages
7,518
Re: Restoring a 1966 Johnson 6hp Seahorse

The 1966 6 hp is a good motor. I had one on a 17' square stern canoe and it was to much power,
 
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