Running and then bogging down would lead me to think you have a CHOKE problem with your carb. Once the engine gets warmed up, it isn't getting enough air, or your mixture seems way too rich.
Just by chance.... have you done ANYTHING to it recently? I once knew a guy who put oil in his crankcase (not needed on a 2-stroke engine) and experienced the exact symptoms you are describing. Basic troubleshooting.... start with the most recent change, and work backwards from there.
Hope this helps.
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