coveredup

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Hi, i have a question about the 72s that I have. I have one old one and one new one. The old one has the older style muffler, sounds great. But out of about 75 flights I have had the motor die in a hover 5 times, about 2 minutes into the flight (my sledge isnt looking so good!!!). Is it fuel draw? My newer one is foolproof, the older one I cant get to mess up on the ground, but in the air. The only physical difference is hte muffler. any input??

Thanks