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sound like you took off the air box and went to a pod filter i know this is an old post but i was just having this same problem and the fix was a 1mm shim i installed into the bystarter where as pushing the needle out 1mm further for new starting point i put is right in front of the wax shaft part that heats up and pushes this shaft out works like a charm my scoot would go up to 3k causing the rear wheel to spin then after a couple of minute settle down
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