Re: Gas on carb
alot of leakage or what looks like a leak is fuel comming out of the breather and the fuel weathers off leaving the oil behind.
Solder will not stick to the carbs body you might be able to rough up the carbs body around the tickler and use 5 minute jb weld to seal it up but it will look nasty.
I do know that the brass fuel inlet has a red gasket under it and all of the engine kits I played with the fuel inlet nipple was not tight.
Something else if you think your float needle is full of trash you can take that nipple out and clean the seat of the float as it doubles as the floats needle seat. so sometimes you don't have to take the float bowl off to clean that part.