It sounds as if it may still be a bit lean at full speed, which I suspect will be the main jet still having a small amount of gum in it. You could fix it if you went over the systems again. From what I've seen of them they are capable of running as well as a pushrod Honda, but probably not for as long, and they seem a bit more fragile, especially if you let the grass build up in the cylinder head fins. The cam belt also may give a little trouble, which is no big deal unless you have to replace it, which requires splitting the crankcase. Realistically I suppose they are a fairly good suburban mower, but I think I'd rather have a chonda if I could find one with a decent base.
