Smoke from old Evinrude 10hp outboard engine

[GILow]

Originally Posted by Vasco

Since 1964 the mixture has been 50:1



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I am pretty certain that our 1986 8hp Evinrude used 100:1. I think that guy may have over simplified things or there were different recommended ratios for the engines sold in Australia. Actually, I am really certain, I can even picture the little label stuck to the side of the engine cowling... It was 100:1 with a picture of an oil droplet.

That's the problem with the Internet, all kinds of people making unsubstantiated statements as though they were facts... Er... Um.... Including me. Oops.


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[GILow]

Originally Posted by snapshotdiaries

I will try and add more petrol as a starting point

Not recommended. If the smoke is caused by something else then you are now compounding problems by running the engine without enough oil in the mix. Like the others said, start with a fresh mix but check the engine carefully for an indication of the ratio, it should be labelled in some way. If in doubt I'd go for 50:1 which will smoke lightly but not badly enough to be a problem.

http://www.thecastlequotes.com/oh-sm...at-two-stroke/




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[Cadence]

Originally Posted by GILow

Not recommended. If the smoke is caused by something else then you are now compounding problems by running the engine without enough oil in the mix. Like the others said, start with a fresh mix but check the engine carefully for an indication of the ratio, it should be labelled in some way. If in doubt I'd go for 50:1 which will smoke lightly but not badly enough to be a problem.

The Castle - Oh smell that! Two stroke. -




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I don't believe running with out oil was anyone's intent. Get rid of the

existing mix and start from scratch. Look it up. I'll bet a thirty years old it is 50:1 ? I'm sure you can find out on line.

[Vasco]

Originally Posted by GILow

I am pretty certain that our 1986 8hp Evinrude used 100:1. I think that guy may have over simplified things or there were different recommended ratios for the engines sold in Australia. Actually, I am really certain, I can even picture the little label stuck to the side of the engine cowling... It was 100:1 with a picture of an oil droplet.

That's the problem with the Internet, all kinds of people making unsubstantiated statements as though they were facts... Er... Um.... Including me. Oops.


Sent from my iPad using Cruisers Sailing Forum

Yes, you're probably right about 100:1 in the eighties. I was replying to a thread that said it was 25:1 in the seventies.

I had a 2002 Yamaha 15 that in North America was supposed to be 100:1 the same engine in the Bahamas, Yamaha recommends 50:1. The 100:1 was for the EPA. I run 50:1, much better for the engine.

[hamburking]

I agree with the consensus above, and would also like to suggest running a can of seafoam through the engine.

[Cormorant]

Also consider trying synthetic 2-stroke oil. It's supposed to smoke less, and have better lubricity. A bit pricey, but might be worth the experiment.

[Siberianhusky]

Try fresh gas, after 3 months todays gas is pretty much garbage.
Run the suggested gas/oil ratio, it's what the carb is jetted for.
Extra oil will cause a lean condition less oil will cause it to run rich.
Need to keep it to that magic 14:1 fuel air ratio, and OIL IS NOT FUEL it doesn't burn (or shouldn't)
Rich and lean has nothing to do with oil content, it all has to do with fuel and the ideal fuel air ratio for a clean burn. (one of my biggest pet peeves is this misconception about rich and lean!)
If you are running 25:1 and you change to 50:1 all of a sudden you have twice the amount of gas and half the amount of oil being passed through the jet for the same volume of liquid, BUT you have the same volume of air.
NOW you have a rich condition because you have too much gas and not enough air in the fuel/air mixture.

[snapshotdiaries]

Many thanks for all the answers. I have a better understanding of the issue and my outboard engine now. As soon as I have tried your advice I'll post the results!

Best
Christoph

[hsi88]

Saw the video. I thought you said it was smoking too much. Doesn't seem to smoke any more than my 2 strokes. :-)