The carburetors on those things are picky, does it flood out when using the pull cord?? how is it mounted? cylinder head down?
If it is flooding with the pull cord then the needle is being held open by a chunk of debris. Unless the cyl. head is mounted down, in which case the plug is getting to wet, you would need to lean out the low speed needle just a little bit.
Also depending how old it is you may need to pick up a carb re-build kit. they are cheap.