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Author Topic:   Older Motor -- What Mixture?
Eric Hinz posted 06-01-2003 07:24 PM ET (US)   Profile for Eric Hinz   Send Email to Eric Hinz  
I have a 25 hp Evinrude of an early-1980s (est) vintage. (The motor is on an early-60s 13' Whaler.) No documentation came with it, so I have never been sure of the correct fuel/oil mixture.

Does anyone have any experience with engines of this era, and what they require?


Sal DiMercurio posted 06-01-2003 10:08 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
I have a 1974 Johnson 25 hp that I run on my Zodiak for diving.
I run it 50.1 with OMC tc-w3 never misses a beat.
It's been under water [ salt ] about 4 times, I just flush it out & she fires right up.
Heck of an engine.
If you post the serial number of that engine, i'll tell you the year of it.
If you can't read the plate, it will be on one of the 2 freeze plugs.
Eric Hinz posted 06-01-2003 11:17 PM ET (US)     Profile for Eric Hinz  Send Email to Eric Hinz     

Thanks for the info. I won't be able to check the serial number until next weekend, but I will post it when I get it.


JBCornwell posted 06-01-2003 11:22 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Forget the serial number, Eric. Post the model number.

OMC specified 24:1 mix for engines built before 1964, 50:1 after that.

Red sky at night. . .

Eric Hinz posted 06-10-2003 10:46 PM ET (US)     Profile for Eric Hinz  Send Email to Eric Hinz     
O.K., I have the model and serial number for my motor:

Model: E25RCNB

Serial: E0066915

Sounds like 50:1 might be the answer. Any information is apperciated.


whalersman posted 06-10-2003 11:13 PM ET (US)     Profile for whalersman  Send Email to whalersman     
1982 Evinrude 25 HP...

E = Evinrude
25 = HP
R = Rope
C N= 1982
B = Not sure what this is used for

Bigshot posted 06-11-2003 09:21 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Imbedded in the model number is the Make, horsepower and year of the engine.
For example:
If your model number is J200TLCOS your engine is a 1985 200hpJohnson engine.

The first Letter corresponds to the first letter of the make of your engine.
The next numbers are the engine hp.
The second to last two letters correspond to the year listed in the chart below.
1980(CS) 1981(CI) 1982(CN) 1983(CT) 1984(CR) 1985(CO)
1986(CD) 1987(CU) 1988(CC) 1989(CE) 1990(ES) 1991(EI)
1992(EN) 1993(ET) 1994(ER) 1995(EO) 1996(ED) 1997(EU)
1998(EC) 1999(EE) 2000(SS) 2001(SI)

Eric Hinz posted 06-17-2003 07:47 PM ET (US)     Profile for Eric Hinz  Send Email to Eric Hinz     
Thanks to all for the information.

I'm off to get some 50:1 gas!


rsgwynn1 posted 06-18-2003 08:32 PM ET (US)     Profile for rsgwynn1  Send Email to rsgwynn1     
I'm off to get some 50:1 gas!

Oh dear, I foresee trouble here.

whalernut posted 06-18-2003 09:13 PM ET (US)     Profile for whalernut  Send Email to whalernut     
Eric, make sure you mix that puppy right!! 16 Ounces for a 6 gallon tank and 8 ounces for a 3 gallon tank, you can take it from there!! Also, says on the back of most 2 stroke Oil bottles, good luck and have fyn in your boat dude!! Jack.
Sal DiMercurio posted 06-18-2003 09:23 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
When trying to determine the year of your engine, OMC uses the word "INTRODUCES" to code your engine.
starting from the back of your model number go to the 3rd letter from the last & only use the 3rd & 2nd letters from the back, thenm write the word "INTRODUCES" which in your case is "CN", the "C" is the 8th letter in the word "INTRODUCES" so we know it's an 80s model, now the 2nd to the last letter in your model number is "N" which is the 2nd letter in the word "INTRODUCES" so your engine is an 82.

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