is it worth pulling the carb off, apart, cleaning out what you can see (maybe replace some rubber bits?) then re-assemble and check ? I've done this on a few small engines and never made one worse - most of the time made it better.

this might be something you can do in a warm basement/shop as opposed to car repair that requires time in a cold(?) garage.

-John

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2009 Kia Sedona
2009 Honda Odyssey EX-L
12006 Jetta Pumpe Duse
(insert Mercedes here)

Husband, Father, sometimes friend =)