RE: Comaprible 4stroke to ST G90
I had a supertigre 90 on my funtana for 3 flights. what a turd that was. The 90 barely spun a 13-6 prop. I put a saito 125 on it and it was night and day.The ys 91 should do well. If you go with YS, get the 110, You will be much happier. I agree with seanychen