I have performed the break in period at suggested/described. The engine (magnum 0.91 / 14X6prop / 10% feul) is running nicely and it transitions very well from idle to high speed (which I have set at about 8800rpm for now till its broken in better). The only problem that I am having is this: The needle valve is very (too) sensitive (more so the leaner it gets). at 8800 rpm it only takes 2 clicks to completely lean it out to 9800rpm and then one more click to reach too lean and the rpm starts going down again. My other four strokes allow a little more range in the needle valve at the top end. Any advice?