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I had this issue a little over two weeks ago with the 150cc. Not sure this is your problem. I removed the carb top with the two screws where the springs pop out. I put it back on but didn't tighten one of the screws enough. Air was getting in between the carb. I started to ride but it wouldn't go faster than my 50cc scooter. Came back after a half mile ride to the house. Tightened the screw and the 150cc was back to normal.
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