needs moved to electrical but anyway I have a few questions for you
1. did you used fully charged batteries? The fix. make sure they are fully charged up.
2.did you use the right spacer. there is a number on both the motor gear and the second gear make sure they match your spacer numbers. the first one is your motor gear number. if you just took the one off the stock one and put it on your S2 then all you have to do is put the motor back in with the stock spacer. the green colored second gear is 23 and the stock and orange is 25. all the numbers are on the back of the gears so it is pretty hard to not know what spacer to use
3 what should you do. if I was there right now I would have it running like a champ
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