I installed the red Turbo Motor from the ZZ Fast & furious kit and now my Z-car stutters.. It used to just stutter around the fridge and at long distances but now it will start zoneing out at 4 feet in all directions. I tried switching pinion gears and tried different gear ratios but with no change. Of course when I put the origional 2.2 motor back in all is fine again. Is there some known issue with the ZZ motors? I filed down the bump at the end so it would fit properly.. I also tried putting in a bit of foil in the contact area thinking it might not be getting proper contact but to no avail. Are the motors slightly different in size? Is it a postion issue? too loose or tight? Thanks in advance
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