I am on my way to Wally Mart to purchase another can of Berrymans or other soaking cleaner. I do a lot of carburetors. I have noticed lately after a clean and soak that is is not the miracle cure it once was. I call it a fail. Meaning rework. Meaning I can tell I still have a fuel issue. Whatever is in the gas these days is leaving all kinds of particulate matter in fuel lines, filters and of course carburetors. Now I have as I should have been doing all along, been taking out all of the fuel sytem and cleaning it.. Small brushes through the hoses, new filter( no more backflushing) , monofiliment in each and every jet and orifice. Key words"each and every". I had a custumer bring back a motor twice. Each time the carb was filled with the yellowish powdery substance. . It was breaking loose from inside the fuel lines, especially at the elbows. So although the carb was cleaned the motor would start and run like a champ until it did not. It was fuel delivery. Not saying your issue is the same. You may have a kink, a bad pump, a bad anti syphon valve, an air leak, cracked hose or diaphram. Start at the tank and move forward.
I am starting on my Yam 130 today. Not saying I will finish but I will be at least starting. I hope we can help each other out here.