Some of you have pointed out how hard it is to change pinions on the SC10 4x4 as explained in the manual because you have to remove the motor with the pinion attached.

That isn't true from my experience on Saturday.

All I had to do is use the provided alen key to turn the pinion screw out.. pulled the pinion off the motor... loosen the motor for adjusting to new pinion size. Slide the new pinion on and tighen it's screw down with the alen key. line up the teeth for both spur and pinion and tighten down the motor.

Was so easy... no need for buttun head hex wrenches... just use el chepo alen key!