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Stock CYMA pistons are beasts, start with swiss cheesing that.There are many guides on the internet on how to correct AOE. Also, there's a chance that the 9.6V might not have enough power to supply to the motor if you use 13:1.
If you want roughly 20 RPS, just get a LiPo and a neodymium motor. Still, remember to test AOE, shimming and swiss cheese the piston.
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