Quote:
Originally Posted by ILLusion
Poor shimming or a motor adjusted too tightly can create a huge current load. The result is massive current arcing as the trigger comes close.
Electrical arcing can easily reach temperatures high enough to literally shoot a hole through the metal. He's lucky only the plastic melted, so it can be saved. I think I have a couple of old smoked trigger circuits around here with holes burned through the metal contacts.
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Further to the above, the OP noted that the gun has shot 5000 rounds with lipo in the past. So...it could be the way the new owner is interacting with the trigger. I am making no judgement, but ensure that he is fluidly and fully pulling the trigger. Messing around with partial pulls is the best way to cook your trigger contacts (because of the arcs that Illusion describes).