I can tell you for a fact the viberation is no where near a 50cc gasser. Nothing came loose, not even the canopy screws. I do happen to own a DA50. and the weight is not bad for the power. and it's a bit less money than the YS I think. the LHS has a YS in the showcase for $550.00 but now that I think it may be a 1.40 sport. not sure how much the 1.60 is. There are a few YS motors at our field and they seem to be trouble for the guys that own them, no one seems to be able to tune them right. I don't and never have own one of them so I don't know whats up with it. I know they must be great motors just no one in our club knows how to make them run. Something about 3 adjustment screws instead of 2?????
My experience with Saitos has always been fire it up and go run it. this is the first one to not go straight out of the box and as I said I think it's the prop selection. I just got all the honey do's done and will head out to the field soon armed with a bit smaller prop. Just remembered I forgot to charge my glo stick so it will ba a while now.
I'll report back this evening. I'm not scared yet.

Miloh