And I'm the "friend" (thank you, Dick.... ) and I've never mounted a gas engine servo ANYWHERE but **on** the engine box. Until this season, ran only JR PCM on 72Mhz, and didn't have problems. I don't deny that the manufacturer makes recommendations that they believe are "guaranteed Safe", and I think that's a good thing.

I am not the ONLY person that has installed servos on the engine boxes.... in fact, if you polled for that question, I think you'd be surprised at the responses.

And yes, so far, the direct-connected A123 battery is working on my RC-EXL ignitions; I cannot state whether they will be okay with any other brand or configuration of ignition.

I also am only running Spektrum 2.4 modules on my JR 9303 using either AR7000 or AR9000 receivers.