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The flat disc in the fuel tank is likely off of the gas cap. It is not a big issue. Clamp the fuel line shut and then take the bolt out of the bottom of the carburetor that holds the bowl on. That is the main jet. It has holes in the sides and one down through the center. Use a small wire and clean out those holes and then try it. Let me know.
Sorry about that. I thought you has a larger engine. Sorry. You have the tank mounted carburetor. On thatt model the problem is likely the diapram that needs to be replaced.
That is correct.See this link.
If it is still doing the same thing then it sounds like something is plugged up internally in the carburetor. Make sure that you have the gasket and diapram positioned correctly.Make sure the diapram is against the tank. Make sure the fuel you are using is less than 30 days old. Those plastic carburetors do not like to be soaked, so if you still have problems then you may need to replace the entire carburetor.
See attached link. This is the entire service manual for that engine. Click on download and wait for the timer to expire and then click on download again.