I think you are the only one, who can answer that question. How attached are you to this scooter? How much money are you willing to put into a 9 year old.... About $100 for a top end kit....about $300 for a complete, new 157QMJ unit, or 3 times that for a new scooter.
Properly cared for, they will run trouble free, much, much longer than your's has.
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