I believe 'Bone' and 'Skypilot_one' have the right idea ...... I would strongly consider their advise except that I would go over to the 'Tower Hobbies' website and order me one of those $50.00 "SuperTigre' engines, this with a GOOD two year (or is it 3 years now) warranty that will be honored in the future. Keep your Enya .40 carburetor just in case you have problems figuring out the 'SuperTigre' carburetor's alleged woes! I promise you that the 'SuperTigre' is a much higher quality engine than is the 'Enya 40SS' engine, not to mention the much greater $$value$$ for the $$dollar$$, nearly instant parts availability, dependable warranty service, and most likely superior Power Output.