cam4569
70cc twin V2
What are you running for a bec or rx pack? It sounds like the servos are not good if others will work in their place. I have not looked at thw hs servos at all are they the same wire pinout as others ie the power and ground are on the correct orientation to the beveled edge of the plug? Are you using extensions or did you solder longer leads on? It is possible to push the plug in backwards especially on the 7 + ch rx which has some give to the plastic. Also and not to sound like a smart ass or anything have you verified the battery is wired correctly? Working on electronics you want to start at step 1 and re check everything. I assume you tapped or shrink wrapped the motor leads so they could not touch each other? That is a lot of power and wouldnt take much to arc out. Sorry so short rushed morning..