I just noticed I never reported back on my OS 70/Aresti arrangement. The engine worked perfectly. I did need some help adjusting the low end. But ultimately it ran beautifully. I had a lot of fun with the Aresti for most of last summer. But around mid August I dumb-thumbed it into a soybean field and pretty much destroyed the plane. I've since cleaned up the OS70 and installed it inverted on a Venus 40. The engine runs nicely, but I had trouble adjusting the low end again. I'll try again this weekend. This setup may be dicier, since I don't think I have the tank centerline and carb near as close as I did with the Aresti.