Consult the recommended dilution ratio on the bottle of two stroke oil you are going to use. Always dilute at that ratio and you won't have any problems.
The engine doesn't have a clue what ratio you are putting in, so unless you are using the manufacturers own oil, any ratio recommended by the manufacturer can be disreagarded.
Too much oil and it will smoke and oil up, too little and excessive engine wear leading to seizing will occur.
If the oil states 50:1 then dilute it at 50:1 and this will give your engine the correct protection.
A 100ml bottle of 50:1 2-stroke oil is perfect for adding to a 5 litre can of petrol- shake it up and it's mixed.
If you don't require 5 litres, then you can easily obtain a 2-stroke mixing bottle which is suitable for gauging the correct dilution ratio a litre at a time, which is a more suitable quantity for home owner use.
pleasant, August 2008