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Old 29 April 2011, 19:55   #11
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Originally Posted by Nos4r2 View Post
No it's not-that's 44:1 if you use 1/2 litre to 22 litres.
I stand corrected,,, but I will still put 1/2 ltr in mine. I can't be arsed using a syringe.lol
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Old 29 April 2011, 23:24   #12
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I stand corrected,,, but I will still put 1/2 ltr in mine. I can't be arsed using a syringe.lol
Mark up a coke bottle. It's better than oiling your engine up and making it run weak.
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Old 30 April 2011, 05:58   #13
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40hp mar/merc forget the 100.1 decal remove and put it in the dustbin, always run at 50.1 a little bit of extra oil will not hurt and always run a little bit to rich, NEVER run a bit lean maybe good for fuel consuption but you will shorten the life of the p/h.
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Old 30 April 2011, 13:37   #14
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so 50:1 is 25ml of oil per ltr fuel .............. yes?
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Old 30 April 2011, 14:02   #15
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ah haaaaaaaaa

http://www.csgnetwork.com/oilfuelcalc.html

20ml per ltr
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Old 30 April 2011, 16:25   #16
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2cyl is a Yamaha based motor and is 100:1
no it was a 2cyl yamaha based motor and 50:1 when I had one as per my previous post, despite 2cyl yams of that vintage being badged at 100:1 Stick 50:1 in and it'll be fine. Mine never let me down in 15years of year round use all round the uk and on three different boats. Stick 100:1 in and it would prob still be ok but we never ran any of them at that ratio no matter what the badge on it- its an awfully small amount of oil in an engine and more certainly aint gonna hurt, make it smoke or foul the plugs but it will ensure some decent lubrication.
Oh I do miss the smell of two stroke in the morning!
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Old 30 April 2011, 17:27   #17
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Thanks guys, Ive been out on it all day today running it 50-1, 100ml per gallon and it ran well all day!
Regards Richie
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Old 01 May 2011, 15:34   #18
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brilliant engines-bombproof-go for ever. Unlike the mercury derived later ones
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Old 02 May 2011, 09:46   #19
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I guess it depends what you are doing with it. If you spend the whole day pootering about at idle to fish or rescue sailing dinghies, you could get away with a lighter mix.

Bear in mind some of the auto oilers run something like 200:1 at idle!

I will having said that agree with above -if you are running flat out most of the time, 50:1 won't do it any harm.



For what it's worth, when pre- oiling a tank, the thing to remember is that for 50:1, 2% of your tank volume should be oil, so for a

30L tank, you need 600 mL of oil
25L tank, you need 500 mL of oil
22L tank, you need 440 mL of oil
5L tank, you need 100 mL of oil

The down side to this is that you can't use a standard Cola bottle to "pre charge" a 30L tank...
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