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What I'd do ... and did, .. with one of my old scooters was remove the starter and take it apart. Mine was oil soaked and a winding on the armature was burned. The starter wasn't worth trying to repair, I got a new starter and that worked for me. Something like this could be the cause of hard starting with your GY6. The extra amps could be enough to over come the bad starter. If the battery is good and the starter is good and the cables and connections are good, it ought to at least start without jumping it. Why does it not stay running? Vacuum leaks, idle mixture adjustment, valve clearance adjustment. By the way, you can cut slots in the sealed carburetor screws holding the bowl on and remove them with a screw driver.
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