when i had my savage xl i found that the hump pack that came with the truck was pretty weak, considering the size of the truck and the fact that the steering servo is a metal gear , higher torque servo. i found after a short run time the hump pack just didnt have the juice to keep the servos working properly.

i began to use a losi 2s 2000 lipo with a losi voltage reducer instead of the nimh humpack and i never had another problem with my servos. i could get an hour runtime out of the losi lipo before having to recharge it.

as far as the 5.9 motor i never had ann issues of the needles falling out. i dont think thats common for the 5.9 motor. maybe the axial 4.6 yes but not the 5.9 hpi