Need help with old Johnson Sea Horse 6HP

[waldo0054]

I can not find the model or serial number listed anywhere with Johnson and I need to know the year of the motor, the spark plug number, and the gas to oil ratio, and the type of the oil----I am very new to the boating area and need all the help I can get----thank's to all who can help

The motor is ---Johnson Sea Horse---6HP
The model#----LD-12A
The serial#----J2720944

All this information was taken from the mfg plate on the transom bracket

Thank's to all

 

[crxess]

Re: Need help with old Johnson Sea Horse 6HP

LD-12 > shows as a 1967 5h.p.

http://shop.evinrude.com/files/Model Number Reference.pdf

page 44

 

[Willyclay]

Re: Need help with old Johnson Sea Horse 6HP

Welcome to the iboats.com forum. The experts here, which I am not, can help you with any issue involving your boat, motor and trailer. According to the chart I could find, your motor requires Champion J6C spark plugs gapped at .030inch. See the link below:

http://www.boatsetup.com/SparkPlugChart.pdf

Since your motor is a post-1964 model, it can use a 50:1 gas/oil ratio. The oil should be two-cycle, watercooled specifications, TC-W3. The "3" designates third generation products as "1" and "2" are not sold anymore. A lot of the members swear by the synthetic oils for less smoke but just make sure it is TC-W3. I have a 1973 model. Good luck with that great old motor!

 

[waldo0054]

Re: Need help with old Johnson Sea Horse 6HP

Thank's for all the help--on the spark plugs we went over the motor looking for more info and found an original sticker which listed these plugs for this motor--champion-J4J, AC-M42K, Autolite-A21X,------is the Champion J6C a replacement for those older plugs ?????

Thank's

waldo

 

[crxess]

Re: Need help with old Johnson Sea Horse 6HP

Newer Champion plugs are:
J4C - General use
J6C - Low speed/trolling(hotter plug)