use a 50:1 mix it will not harm it,I am asuming that you use it for leisure , if you was useing it for commercial purposes the factory, would recomend 50:1 anyway.As i used to say a little extra oil helps to protect the inside of the power head.
I can only partly agree that over oiling won't harm a two stroke. You can get away with it on the old yamaha/mariners as they could run in both 1:100 or 1:50, but only on certain model. Always best to stick to the recommendation of the manufacturer. Under oiling will kill an engine stone dead. Over oiling will gum in the rings and spoil performance. It was deadly on the newer 3 cyl yams as it bunged up the scavengers if the engine was used at lower rpm for long periods. It does not take very long if too much or the wrong oil is used. See attached photos of a 50 with very low hours.
