clean all the plugs and redo the carbs again...
It's tedious, but it should get you a lot closer to where you need to be. IF the tops were loose.. there is no telling if it was spilling fuel constantly to foul plugs...
You might want to check your valve lash... then do the following--
Clean Plugs
Disconnect linkage
Set idle low as possible and run..
Set mixture on each..
Set idle on each the same...
re attach linkage...
see whats up!
