RE: multiple throttle servo failures
I have used the 5245 from hitec in my 35% yak... burned 3 sevos one of them to the point that smoke came out from it. I was told that that servo doen´t like the 6 volts.
I tried two more on a smaller plane with a 50cc engine at 4.8 volts and they have been working for two years. The ones on the 6 volt plane burned after 2 to 4 flights.
Now I use hitecs 645 on throttle and choke, three and a half years latter no problems.