1. Don’t fly with low-end needle at factory setting!
2. Buy immediately any of cheap tachometers.
3. Turn in you low-end until your engine will hesitate to throttle up (to 1.1/4 turns from factory settings!). After that turn the low-end out ¼.
4. Adjust your high-end by max rpm and turn it out by 200 rpm less.
5. Fly after all above is done. Use 13/6 prop.