The most common cause is a grounded stator. Lack of primary oil or a too-tight chain can also cause excessive chaincase heat.
Chain too tight
A bad, stuck or dirty float needle inside the carburetor.
bad seal in between your intke manifold and carburetor
your float is stuck in the carburetor. Clean it with carb cleaner.
A misfire will cause flames to come out of the carburettor
Usually a stuck float mechanism.
carburetor or spark plugs
The float valve in the carburetor is not working properly. You will need to remove the carburetor and clean it or replace it.
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needle & seat maybe dirty , also check float level
Sounds like you need to clean your carburetor. Before messing with the carburetor, check the fuel filter - it might be clogged.