Ernie Thanks for the update on your Uproar. I'd love to say mine balanced perfectly, but never have been able to say that. With standard rcvr battery pack located at far forward in wing, I still had to use a Higley Heavy Hub inside the spinner to balance. I was surprised because the muffler on the Tiger Shark is a rather stocky affair. But that's what it took. Began engine break-in today. The Tiger Shark is the easiest I've dealt with in a long time. Starts with a flip cold or warm, transistions great, and idles like a lazy dog. Pleased so far. Weather may be a factor with Dennis. Let you know. Mark