With todays gasoline it turns to what is called varnish very rapidly and more than likely some of the fuel that set in the carb over those 6 months has turned into a gummy varnish so the carb probably needs cleaned, If it is not to bad you can probably adjust the carb with the air/fuel mixture screws and keep it running well till end of the season, shouldn't take more than 1/8 to 1/4 turn though. I hope this helps
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