Hey games, I had the same issue with my H9 Arrow and chose a slightly different route. Everyone at the field was mystified with the flywheel that comes with the PTS Evo engine. I chose to eliminate it altogether with the prop driver washer that comes with the Evo 46. Easiest $2.99 decision I made. The engine transitions to full throttle and back down again a bit quicker without all that extra weight on it.