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Hello dear friends, I decided to change the Haydusha 9.9-15 to Heidi 9.9 Pro. I thought for a long time, collecting information on how to squeeze out of it those 20 hp that the Heidi factory promises. Before buying, I found out that there is not even 18 there. But the issue is solvable, which is what I, your humble servant, will do. I will shoot a video about each step to improve this engine, and if there are failures, you will also find out. Maybe my efforts will benefit someone.