The engine tached 9200 on the 16-8. I backed it way off to keep it cool in the cowling. The model flew fine, and at 11 pounds, the 2300 pulled it very well. Ran perfect. Never so much as a hiccup, spit, pop, or sputter. Ran well at all power settings, and cruising at 1/3 throttle is not an issue. No hesitation from idle, and no leaning in flight. What more could you ask for? I very happy