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Engine bogs down?

2007 TGB 50cc scooter bogs down the more throttle I give it. I let off throttle an runs fine, can't get it over 15mph then starts bogging down. Starts fine. Changed fuel filter, cleaned air filter, new spark plug.
Rick, October 2011
Dont really know how.

Rick, November 2011
have you checked main jet. it might be blocked.

ray b, October 2011