Something else I've recently come across for future reference.

For those that run an engine on a stand without a radio then install the engine and have a throttle curve set up in the transmitter, look out. It's very easy to have the curve set up in such a manner that will prevent the butterfly from opening but a tiny amount at stick positions up to over 1/4 throttle. That's another reason an engine run on a stand and later mounted on a plane may not start.