Im new to modeling and recently purchased an alpha 40 trainer with the evolution trainer power system. The plane flew about 10 times and all but 4 of the flights ended in deadsticks. Decided there was an obstruction somewhere in the fuel system. Back flushed eveything, no luck. decided to take apart the remote needle valve assembly and was unhappy to find 7 small pieces of aluminum underneath the inlet fuel nipple. Removed them, one more flight and another dead stick. Then another club member noticed it sounded "weird" as compared to his evo 46. Discovered the bearings were shot with pleanty of movement in them. HORIZON SENT ME A NEW ENGINE WITHIN 5 DAYS, HORIZON HAS BEEN EXCELLENT AS FAR AS CUSTOMER SUPPORT AND I THANK THEM!! just got the replacement engine and gave it a good inspection. Decided to put thread locker on the long muffler bolt and when i ran my finger through the muffler insides it came out sparkling with aluminum dust. Cleaned that all out and then decided i had to check in the needle valve assembly again. This time 9 small half moon shaped pieces of aluminum were found just below the threads in the exact same spot as last time. Seems that the threads are being cut and that the removed metal is staying in this tiny aluminum casting. HORIZON HAS A GREAT ENGINE HERE BUT THEY NEED TO DO SOME CHECKING ON THE CLEANING THAT IS GOING ON AT THE ENGINES FACTORY. Other than these bits of metal found, the engine ran great, two flips and was running smoothly. It hasnt been in the air yet because the ups man just delivered it yesterday. I URGE EVOLUTION ENGINE OWNERS TO DISSASEMBLE THIS NEEDLE VALVE ASSEMBY AND MAKE SURE IT IS CLEAN. even if you dont HORIZON HAS BEEN GREAT WITH WARRANTY CLAIMS FOR ME but better be safe than sorry. Also many people in my club really like these engines and only one has had similiar problems and again horizon took care of it promptly. I have just written a letter to horizon with the same information but i do not know where to send it, i dont want it simply overlooked by some employee, any suggestions? sorry for the long post but i hope this prevents others from having the same problem, and again THANKS HORIZON FOR BEING SO KIND AND PROMPT WITH SENDING ME A NEW ENGINE!!! cya, Dave