Dan, I usually remove the decomp as a first port of call, to prove or disprove this potential problem. Playing with about 10 carbs means having a cracked carb is a low chance. Sure I have some carbs that just don't work so I move on to another one. Bumps has one that is working perfectly, but he is reluctant to pull it off for investigation in case it never works again and more importantly it is his wifes mower. Words have been uttered that go something like this "don't you touch my mower"
