Johnson Sea Horse 3 HP

D

doug3386

Cadet
Joined
Jun 12, 2005
Messages
9
The model is JW 13. The serial number is 241339. Does anyone know when this would have been made? Is a full range of parts available? Any comments on rebuilding? I just pulled the carb tonight. It's clean now but will need the felts, gaskets, needle and seat valve replaced. Compression seemed low too. Rings and crankcase seals?? Spark good. Lower end inspection? I'm new to the marine stuff. Have had lots of practice with bikes though.<br /><br />thanks
 
JB

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Johnson Sea Horse 3 HP

That little jewel was made for the 1957 model year, Doug.<br /><br />Fuel mix is 24:1<br />Champion J4C plugs, gapped at .030"<br />Magnetos points gapped at .020"<br /><br />Don't do any more until you have a Service Manual.<br /><br />Any parts you can't get here: http://www.boatmotors.com/parts/ you should be able to order from your BRP dealer or NAPA store. Last resort is a dismantler like tcoutboard.com<br /><br />What sort of compression "seemed low"? What was the spread between cylinders?<br /><br />Those engines die more often from being "fixed" without a manual than from all other causes combined.<br /><br />Good luck, and welcome aboard. :)
 
JB

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Johnson Sea Horse 3 HP

Have you tried the Edit Post button, Tom? Works great. :)
 
TTravis

TTravis

Petty Officer 2nd Class
Joined
Dec 17, 2004
Messages
120
Re: Johnson Sea Horse 3 HP

No, but I will try that next time I make a mistake.<br /><br />Tom Travis
 
D

doug3386

Cadet
Joined
Jun 12, 2005
Messages
9
Re: Johnson Sea Horse 3 HP

Thanks for the info JB. I went to the OMC dealer today to pick up a carb kit and was pleasantly surprised. The cost was less than I expected and the kit included the float and needle/seat combination. I guess since Bombardier picked up the line after OMC went tits up I get the advantage of in country distribution. What a rare treat! (I live in Canada.) Anyway he suggested that I use a foaming decarboniser/gum out called OMC<br />tune up. I have always been sceptical of chemical fixes but he said basically what you said that rarely do these engines need to be taken apart. At any rate I am hopeful that this thing has possibilities to run. <br /><br /> Thanks to Tom Travis too. That is a really good article on restoration!<br /><br />Doug
 
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