4 hp Evinrude Lightwin motor, gas to oil ratio???

[hiramabuf]

I would like to know the year of my 4 hp Lightwin Evinrude motor I bought it years ago, new. I haven't used it in the past 10 years or so. I have also forgotten the fuel to oil ratio,as well and need to know this. The serial number as I can make it out is 4206SC69582. Any help would be greatly appreciated.
I just about finished building myself a 14 foot flat bottom boat ( in the paint stage) and plan on getting back to fishing now that I am retired.

hiramabuf (Frank) ...

 

[JB]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

Need the model number, Frank.

I think all of the 4HP Evinrudes are 50:1 drinkers, but with the model number we can be sure.

 

[hiramabuf]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

JB;
Not sure where to find the model number, I thought the name Lightwin was the model number.

Hiramabuf ( Frank )...

 

[film495]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

pretty sure the real real old ones are 25 to 1 - I think in the 50's it went to 40 to 1 and probably modern ones are 50 to 1, so - if it is fairly modern you are probably OK running at 40 to 1 until you find out for sure. I have a 68, 3hp Evinrude that is mixed 40 to 1.

 

[Rick.]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

There should be a tag on the transom bracket, port side with the model and serial numbers. Rick.

 

[JB]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

pretty sure the real real old ones are 25 to 1 - I think in the 50's it went to 40 to 1 and probably modern ones are 50 to 1, so - if it is fairly modern you are probably OK running at 40 to 1 until you find out for sure. I have a 68, 3hp Evinrude that is mixed 40 to 1.

Earlier than 1964 were 24:1 or 20:1. All after 1964 are 50:1. Your '68 should be running 50:1.

I don't think Evinrude made any 4HP Lightwins before 1964.

 

[tx1961whaler]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

Earlier than 1964 were 24:1 or 20:1. All after 1964 are 50:1. Your '68 should be running 50:1.

I don't think Evinrude made any 4HP Lightwins before 1964.

Unless it is a pre-war 4 hp (older than 1937), it is a 1969 or newer motor. All of which use 50:1

 

[Chinewalker]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

As a personal preference, the Lightwin 4s still used babbit bearings on the connecting rods up to the late 1970s, and as such I like to run them a little on the fat side for oil... I've seen a lot of holed blocks in those little motors due to tossed connecting rods...
- Scott

 

[hiramabuf]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

Thank you all for the info. I know it was bought after 69, as that was the year I moved to my current address, it was some time after that I bought the 4 hp. motor. Just not sure when. But I will go with the 50-1 ratio.

Thanks again, hiramabuf (Frank) ...PS Just finished the final paint coat of Fire Red on the 14 footer I built.

 

[Vic.S]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

Erm
4206 is the model number isn't it?
That would make it a 1972 model!
.
.
.
.
or a 1937 1.4 hp

 

[film495]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

not to hijack the thread, but my owners manual for my 68 says mix at 40 to 1; so - why do you say 50 to 1. Has oil changed? Did OMC change the recommended spec?

 

[Vic.S]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

http://www.evinrude.com/en-US/About.Us/FAQ/Oil.Fuel.htm?popup=true#Q2

But with plain bearings in there a bit more oil would not go amiss.

 

[film495]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

http://www.evinrude.com/en-US/About.Us/FAQ/Oil.Fuel.htm?popup=true#Q2

But with plain bearings in there a bit more oil would not go amiss.

that is very very interesting. for now I think I'll still run the 40 to1, but I also have a newer merc that is 50 to 1, so it would really make the mixing a lot easier if it was all the same ratio.

 

[tx1961whaler]

Re: 4 hp Evinrude Lightwin motor, gas to oil ratio???

that is very very interesting. for now I think I'll still run the 40 to1, but I also have a newer merc that is 50 to 1, so it would really make the mixing a lot easier if it was all the same ratio.

40:1 would be fine in both. A little extra oil doesn't hurt anything.