I agree Jack.. No such thing as running a motor in. Tune it and fly the snot out of it. Our gas engines are extremely low tech and no different than a chainsaw or weedwacker.

I'm with Lorne or Jack...likely a bad ignition. Box it up and send it back.

My EME35 with the walbro carb runs so mint. Had it out yesterday again. One of the smoothest midranges I've had and it really freaks people out when I tell them it's on a pipe, LOL. Totally destroys this mith that pipes will screw up midrange. The Planebender Smoothpipe is a work of art...both performance and sound.