Have an older Johnson SuperSeahorse, need to find out what year

[aerinah]

Numbers off the motor as follows:

Model RXL12M
Serial J2455809

Any help is greatly appreciated

 

[Paul Moir]

Re: Have an older Johnson SuperSeahorse, need to find out what year

That's a 1964 28hp you have there. I've got a '62 myself.
Additional info:

Displacement: 35.7 cubic inches
Fuel/Oil ratio: 50:1 using 87 octane gas and TC-W3 outboard oil.
Spark plugs: Champion J4C replacing the old J4J, gapped at .030"
Lower unit fluid: OMC/BRP HiVis, or equivalent 90 weight outboard gearcase lube.

According to the L in the model number, the engine left the factory longshaft to fit a 20" boat transom. If it's still present, there will be a 5" spacer bolted between the lower unit and the midsection.

 

[Chris1956]

Re: Have an older Johnson SuperSeahorse, need to find out what year

The newer spark plug is the J4C. If you have fouling problems, you can go with the J6C plug. I think the point gap was .020. Watch where the plug leads exit the flywheel. You do not want them to rub.

 

[aerinah]

Re: Have an older Johnson SuperSeahorse, need to find out what year

Very cool ... we have been trying forever to get back out sturgeon fishing... we've been away far too long and are this >< close to getting there... thanks for all the great info!

 

[BTrudel]

Re: Have an older Johnson SuperSeahorse, need to find out what year

HELP!!!
We just purchased an older Pontoon Boat with a Johnson Super Seahorse Electromatic, on it. There was no paperwork with it, so I need someone to tell me what Year and HP our motor is if anyones knows. We would be very grateful.
Model # is RK26S
Serial # is 2412695

Thank You