1955 25 hp Johnson Seahorse Fuel mixture

Jake362

Cadet
Joined
Oct 23, 2005
Messages
21
I would like to know what the fuel mixture is for a 1955 25 hp Johnson Seahorse (RD-17S). I found one at an Estate sale and a friend of mine bought it. I told him that I thought the mixture might be 16:1, but I wasn't sure. What is the actual mixture for this motor? I kind of regret not getting the motor myself. When we opened up the cowl it looked like had hardly been used and the rest of the motor is in almost mint condition without a single dent in the cowl. By the way, he paid only $50 for the motor!
Thank You
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: 1955 25 hp Johnson Seahorse Fuel mixture

That was a great price for the engine.
16:1 would be a safe bet, a lot of people run them at 24:1.
 

Jake362

Cadet
Joined
Oct 23, 2005
Messages
21
Re: 1955 25 hp Johnson Seahorse Fuel mixture

Thanks! Also thanks for the link. Found the manual for the motor. My friend will appreciate it!!
 

Pies1212!

Cadet
Joined
Aug 27, 2022
Messages
12
Working on a 55 or 56 motor, trying not to tear anything up... any suggestions for fuel mixture etc would be much appreciated.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,043
Run at 24:1 on that.-----Install a new water pump impeller before your first launch.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,043
Click on ---" new posts " ------Should be an orange box on the page.----Just click till you find it.
 
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