The gear ratio is 124 / 15 = 8.27.

My sprague gear was loose causing the engine to overspeed but the blades were only spinning around 1000 rpm. The pressure of the six screws into the Main Gear Hub End Cap (110-149) is what holds the sprague gear in place. I used some locking compound on the sprag outer race (110-153) and tightened down the six screws really tight to fix the problem.

Use a light 3-in-1 oil or Triflow when installing the sprag inner race into the sprag bearing. Double check the orientation as noted above.