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Old 21 August 2015, 17:32   #11
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To be honest a small amount of premixed fuel in a larger tank is unlikely to make much difference. If the premix is a 2% mixture then it is only 98% petrol so there is less petrol to burn than the engine expects. However, if you tip a few spare litres into a 50 litre tank of petrol, it is further diluted. However, better safe than sorry. Getting rid of stale pre-mixed fuel was one of the mildly irritating aspects of owning a 2 stroke motor.

Either way, as I said, there are pros and cons. 2 stroke is lighter, cheaper, simpler, but noisier and dirtier.
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Old 21 August 2015, 17:47   #12
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Why not just mix the two stroke in the outboard tank as required whether it be in an an external or integral outboard tank.
I use a 4 stroke main and a 2 stroke auxiliary on my small sib.
I carry unleaded fuel only in my jerry cans.
That way I've got the option to add 2 stroke oil if I need to use my 2 stroke engine.
Once it's mixed you can't take the 2 stroke oil back out.
I carry a small measuring cap and 2 stroke oil in a small kids fruit shoot bottle - about 200ml with a pop up locking cap.
A quick squirt of 2 stroke oil as required does the trick.
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Old 22 August 2015, 04:06   #13
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Quote:
Originally Posted by Max... View Post
Would this matter? What harm does the oil do?? I'm all diesel cars now but I always used already mixed post season fuel in my Focus and still do in my lawnmower.
That wouldn't do the Focus Cat Convertor much good.

Lawnmower - TC3W is different to air cooled two stroke oil. Lawnmowers (air cooled) run MUCH hotter and you stand a serious chance if the TC3W not working at that high a temp. Likewise air cooled 2stroke oil doesn't work as well at low temps so running an OB on it risks damage.

Small quantities will be fine I expect. Large quantities which based on my strimmer having a 250ml tank is not really a lot will be more likely to coz problems.

If someone has found TC3W that also meets air cooled spec please shout up.
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Old 22 August 2015, 04:36   #14
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If I ever have any outboard 2-stroke fuel to dispose of I never put it in a car... just in case.

But I do use it in my 4-stroke lawnmower and hedgecutter mixed equally with new neat petrol so the 100:1 Mercury/Mariner mix becomes 200:1 which in two decades has never caused any issues. I do have 10l spare for the mower at the moment as I bought an outboard earlier this year with half a tank of fuel but there was no way I could ever trust what quality of 2-stroke oil was used or what its ratio was.

Further than that I'm no great believer in fuel going off over winter so as long as it's a mix I've made with Quicksilver oil I use it next season. However usually I only have half a tank or less left so before the first outing topping it up means the fuel is 50%+ fresh.
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Old 22 August 2015, 05:30   #15
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Loving this new mowernet 😀 I have a toro mulcher
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