Thanks Speedy, Max, Tyler,
Seems a lot of oil to me, but that is what the manual specifies, doesn't it? I am sort of expecting a lot of smoke. I will ask the former owner of the motor. Pretty sure he was running it on half that and the motor is still alive today. It really copped a work out from him for many decades and never missed a beat the whole time.
It is interesting that on the ByNorm 2 stroke container, they specify a whopping 50:1 ratio as a "general" mix, which is only 25 ml oil to a litre of petrol. I am guessing that must be for the small, highly aspirated modern engines like whipper snippers? But now that I think about it, I am sure that is all my dad ever used in his Mayfair and the engine is still going strong today. So I really wonder if it matters all that much. I recall my father would often just take a guess when mixing and never had any problems with his 2 strokes. I never saw him measuring things accurately to the ml. Often he just had a small tin which was "around about right" and he would fill it up and tip it into the jerry can. If he got smoke he knew to add less next time, if the mixture seemed too rich he would tip in a bit more oil. Funny thing, when I was running the Mayfair on the ByNorm specifications it was blowing out a bit of smoke and an older relative told me I was putting too much oil in the mixture! So I'm not sure and totally confused now. Will do what the manual suggests and if too much smoke will cut back.
My feeling is that with a semi-synthetic oil of today you would not require as much as what the manual suggests, because it was written back in the day of old mineral oils. So as Tyler pointed out, I think 40mls per litre would be the most practical.
