I have blocked that hole up in the carb before. Find a suitable sized bolt or something to screw in it. Not too long.
The plastic carb itself is fine. The main issue i have with the whole design is the needle and float. They stick shut, they flood and sometimes you just need to be plain viloent.
Turn the fuel on and shake the crap out of the mower. Bounce it around on its wheels. See if that helps.
Have you swapped any parts around?? There are different length needles. Before i put the primer face on the carb i check to see that the float has some room to move. Its looked a few times like the float will sit down on the needle and barely lift off the bottom of the 'bowl'. So i find a longer needle.
Cheers, Bob.
