It does not close the fuel intake in the carb, it is the valve with rubber on top of valve, this valve is attach to float. When this rubber is dirty or worn it doesn't close the fuel when the float is at max, so the fuel goes out through upper rubber pipe.
SOURCE: 1984 VT 500 C Shadow: 1983 honda shadow -starts and runs, seems to miss ...
The fuel filter is in the tank on the petcock and is self cleaning. I suspect you have bad spark plug caps on your bike the cap is part of the wire. If you remove the wire and take a reading with an ohm meter, the cap should read 5000 ohms . Anything above or below and you should replace the cap. This is probably causing the slight miss.
SOURCE: 1983 Honda Shadow VT750 Motorcycle,
If your bike has been in storage for the winter you may have fuel that has gone bad. Even if you had stabilizer in it. The Fuel pump could be the problem, but it would not be my first guess. The carb is the first and most likely location for the issues. The jets are very small and clog very easy. You may need a rebuild kit. You could try cleaning the carb again. Use guitar string through all of the tiny ports on the jets. Also the petcock may have become clogged. Also check the fuel lines they could dry rot and cause issues.
SOURCE: 1983 vt 500 honda shadow. Replaced
Three things that can cause popping or backfiring. 1)You may have cracked, leaking,or broken intake manifolds or bad o-rings on the manifolds. 2)Leaking exhaust gaskets in the head or between the head pipe and muffler. 3)Bad spark plug caps and partially fouled plugs. Check it out.
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