What is it ???

N

norcal-wrencher

Recruit
Joined
Sep 3, 2004
Messages
3
Just purchased a boat with an older evinrude motor man says it is 25 horse. After reading through some of the forums I believe it is a 1957 18 horse.Can someone please verify what I have and what oil / fuel ratio it takes. I have no manuelfor motor so any help would be great. Serial # is 15922-02732 and I dont see a model #<br />Thanks
 
bubbakat

bubbakat

Captain
Joined
Oct 29, 2002
Messages
3,110
Re: What is it ???

18 h/p 1957 15922, 22.0 cu.in. = 360.5 ccm <br />Fuel mix 24:1<br />champion plugs J4C gap at 30
 
N

norcal-wrencher

Recruit
Joined
Sep 3, 2004
Messages
3
Re: What is it ???

Thank you for the info I take it the first number on the old evinrudes is the model number. Since the guy I bought it from was running it at 50/1 does that do anything to the motor?
 
C

cajun555

Chief Petty Officer
Joined
Dec 20, 2003
Messages
483
Re: What is it ???

norcal, from what i've read on these post on the older motors they had a differant type bearings an required a 24:1 ratio. As for your question, it just depends on how much it was run on a 50:1 ratio. Run a compression check with a gauge from any auto parts store. Your not looking for how much compression, but the differance between cylinders. Shouldn't be no more than 5 psi according to my manual. <br /><br /> Hope this helps.
 
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