Also, you have to be very careful when starting your inverted Saito 150. The center line of the fuel tank is around 1.25" higher than the center line of the carb, so fuel tends to siphon down into the carb and flood the engine when starting. I wasted half a day at the field trying to start my inverted 150. Everytime I flipped the prop over, the engine would hydrolock and I had to remove the glow plug to let excess fuel out. I think I got it figured out now. Should have gone with a YS at the beginning. By the way, a YS 110 is more than enough for this bird.