On the GXV120 carbs, theres 2x bolts that go into the float bowl. 1 that secures the bowl to the carb itself, and a 2nd that acts as a drain type plug?... does anyone have the specs on the drain bolt? Mine went walkabout so was just going to get one from hardware store with a washer and didn't want to have to get a kit.
Sorry for the late respondance just seen the topic.
M6-1.00 x 8mm (thread length) is what I measured here. The one here also using a 10mm socket/wrench or a #3 Phillips (Cross point) driver to install or remove.