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Without the exhaust there's no backpressure and without retuning the carb you'll run lean. Could be you're overheating.
Does it slowly lose power and erratically idle then die? Or does it just dies all of a sudden?
Since the scooter is new to you it's possible it's not exactly in the best of condition and on top of needing an exhaust it could need a tuneup or might need repairs from running a long time with no exhaust.
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