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Brushless for Ecosmart Metro

I'm thinking of purchasing a brushless motor for my Ecosmart. My concern is that the motor I'm looking at has a 14tb sprocket for #420 chain. I would like to keep the same gear ratio as my stock motor. How would I go about modifying this motor to have the right amount of teeth and to be compatible with a 1/8" or #25 chain? 
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We do not carry that same motor so we do not know what sprockets would be compatible with it. We notice that it has a 467 RPM output shaft speed, and the Ecosmart motor has a 2500 RPM output shaft speed. So unless you want the scooter to go very slow then it would not be a good choice for the conversion.

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