yes. Myself I have worked on many 2GX gearboxes. We have 8 KWA's with this gearbox on our team. I do want to specify that KWA 2GX boxes are most definately LiPo ready. Myself I have shot prolly 50k rounds through mine already with only using lipo batteries. I don't know why you put a 150 spring in a KWA anyway as that will take you above almost all field limits with any game, and certainly without modifying the tappet plate to fire semi-only. Im not even entirely sure the KWA's motor will handle a 150 for very long, in fact this could be part of your problem. It will handle a 130, but only just as my second has a 130 in his sr12 modified to fire semi-only so he can get in as a DMR. My guess is you have a combination of 2 problems. 1st the spring is way to powerful for that motor and second, KWA gearboxes have a tendency to pinch wires if not done entirely perfect, and this causes ground-outs on the gearbox, something that can usually be solved with some liquid tape. Of course I'm only assuming this as I haven't seen your gearbox, and you didn't mention that you had or had not upgraded your motor. BTW most motors would have a hard time pulling a 150 without a torque up gear set. There are few out there that wouldnt have a problem with it, however.
