Johnson Seahorse

[muldrew]

I'm interested in finding the year on an old Johnson Seahorse 7.5 hp.<br />I just found your site on the net, Unfortunately I do not have the serial number...motor is at the cottage....will check on next visit....Is there a site that shows pics of different Johnson model years

 

[Bear]

Re: Johnson Seahorse

Old? Like <br />AD-10 7.5 HP 1956 <br />AD-11 7.5 HP 1957 <br />AD-12 7.5 HP 1958 <br /><br />Or 1980 -<br /> http://www.brokeboats.com/omcid.html <br /><br />Pictures of the 1956 and 1958 models<br /> http://mitglied.lycos.de/old_omc/oview.html

 

[muldrew]

Re: Johnson Seahorse

Thanks Bear,<br />It looks like I may have a 1958 model....I will know better when I get back to the cottage....<br />What is the proper fuel/oil mix

 

[mercury1]

Re: Johnson Seahorse

I have always mixed the older motors with preassure tanks at 25 - 1<br /><br />Someone correct me if I am wrong please.

 

[Bear]

Re: Johnson Seahorse

I found 24:1 searching this section.<br /> Evinrude 10 HP 1958 <br />Same era, same type of bearings.

 

[muldrew]

Re: Johnson Seahorse

Well that explains why she might be running a little weird...I was told 50:1 mix....

 

[SeaMasterZ@aol.com]

Re: Johnson Seahorse

50 to one will get the motor mad at you, it will start screeching and force you to row back and replace its powerhead ... <br /><br />its a quart to six gallons, right gang?<br /><br />my math sez so anyway<br /><br />

 

[SeaMasterZ@aol.com]

Re: Johnson Seahorse

Addendum:<br /><br />If you are using it as a troller, low rpm ONLY, 50 to 1 would be ok, some guys run two tanks (newer 50 -1 motors troll at 100 -1, but thats fresh water guys for ya!)

 

[muldrew]

Re: Johnson Seahorse

I have the motor on a 10' inflatable...my 12 year old son does not know the meaning of trolling and enjoying nature....I think its best I try the 24:1 or 25:1 mix....I will let you know the outcome...I'm sure it will run better....<br />Thanks for the info...

 

[mrdh]

Re: Johnson Seahorse

Originally posted by muldrew:<br /> I have the motor on a 10' inflatable...my 12 year old son does not know the meaning of trolling and enjoying nature....I think its best I try the 24:1 or 25:1 mix....I will let you know the outcome...I'm sure it will run better....<br />Thanks for the info...

So what was the outcome? I have a 12ft inflatable with a 3HP, and don't know the oil/gas ratio, have been using 25:1 and 50:1 sometimes... any advice?