Hi

I've been flying my Skybolt for 12+ years now and it's original motor was Satio 1.20 which flew it very nicely, I swapped it out for a YS 1.40 and it's like a rocket now, but you know what they say, if a little is good allots better..

YS are some of the best, but they are pricey, I think that the choice between OS and Satio is a personal one, I've had a bunch of each, they are both top drawer products. Either way, good choice on the 1.20, the Skybolt is spectacular with a big 4 stroke.....

Brian