it sound like you are sucking in too much air into the carb. is there any kind of filter hooked or close to the carb? If there is NO filter there than you need to call the moped store and ask them if they have a air filter for your bike. Another cause could be a fouled spark plug. see if the spark plug is dark black on the bottom. let me know how you make out! Hope this helps, Billy 14yr. Old Moped Mech.
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