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You probably won't be able to consistently reach (much less attain) 70 on a 125. Your best bet would be to accept your likely maintainable top speed is around 60. You can do a whole lot to the motor, but unless it's downhill both ways, even a 150 big bore kit would struggle to do 70 consistently, especially with hills. You can get a 190 motor, but I've heard they have transmission issues, and it would set you back another $7-900 for the motor. You can also change the rear sprocket, but even if you got it geared so it could theoretically hit 70, the motor wouldn't be strong enough to pull it.
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