I was just joking about the make of the engine, almost every hog I have seen has had the OS .91 in it though but that's just because the OS was the top four stroke engine where I came from. Here in NV it seems like the number one four stroke engine is the Saito or YS. A lot may depend on what the LHS stocks and sells or what is used at the field you fly at. In my area there are a lot of IMAC pilots too, not sure if that means anything but a lot of them are using the YS.