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how many mah rating is on your battery. if it's less than 1700mah then that would explain the problem with the upgraded spring, but it should run the stock spring fine. when you seperate the receiver, you should be able to easily turn the sector gear in it's normal rotation even with the motor connected. if you can't then there's a rolling resistance issue that needs to be sorted out (over-shimmed perhaps). now that you have also had a chewed up motor gear you may want to check your motor installation. as with some other brands (g&p to be specific), your motor wiring has a specific route it must take to allow your motor to sit correctly and not bind up due to improper gear meshing. the red and black must both go down the back of the handle, with the red on the same side of the gun as the selector switch and the black on the other side of the screw hole for the motor plate. then the black is connected first and the red goes around the top of motor to connect to the red motor terminal. this terminal should be on the front side of the handle close to the trigger. as with my g&p, my ics m4 was sensitive about wire routing and as you've tried different motors, it seems a logical place to start.
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