You should check to see if that carb fuel line flows freely. If it does, the carb fuel bowl has a screw you can
loosen, it may be full of water or contaminates, so place a rag under it. Put a little catch can on top of rag,
so as to investigate the drippings. You may need to disassemble the carb to clean the jets ect. You tube
has videos you can watch to see how the removal process goes.
Now remove * plug and check the compression, this will tell you the cylinder condition. Hope you have it.
If ya don't have a gauge you put your finger over the hole and crank it slowly. A lean cylinder may have burnt a hole in the piston.