Don't run that engine over 10,000 rpm static as you may float the valves when it unloads in the air and it will be out of its power band. 9,000-10,000 is about right. prop 12/6,12/7, 13/4 etc. I would go with a non wood prop for flywheel weight. Idle will come after proper breakin and tuning. Their is a learning curve with 4 strokes but once set up they run and run. Good luck.