What I ask and am not able to understand is why does Horizon not guarantee this engine regardless of who sold it and who bought it as they are the sole distributor for this evolution engine...I own a new one that has problems but since I purchased it at a r/c show and have lost the receipt then I am left holding the bag....Someone, either the distributor or the manufacturer must be responsible for selling a defective engine....I reported the problems to Horizon Hobbies after 5 minutes of running time...They refused any responsibility due no receipt yet they and only Horizon sells this engine...There are many good companies out there that will work with the buyer/owner of a product that was sold by that company but does not demand a receipt...I can and will live with this and have little good to say for Horizon Hobbies....This engine is not available unless sold by Horizon....It is their baby...they brought it into the world.....Why would this abandon it? Does anyone know the manufacturer of this evolution engine?