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Okay since i cannot disuade you guys i might as well give you some ideas as reference.
Do you know how a clutch system in a 1/10 GP work? you could extend the the rod on the output shaft of the motor and install a clutch with gear on it. so when the desired rpm is reached the clutch engages and kicks up a second set of gear ratio.
Then again i don't know what tools machinery is required.
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