You really should try the 14x4W APC and Coolpower 30% heli fuel before giving up on it. The Satio 82 is the most powerful 40 size drop in engine available. If you need more power then use a Satio 91 or 100. What plane is this engine in. Most of the time a YS 63 or Satio 72/82 are plenty for 40 size planes doing 3D if setup with the right fuel and prop. Also that Satio might need some more breakin time to give full power. Satios need a couple gallons to break in completely.