Likely the tip is broken off the plunger. It was probably stuck in the main jet, fell out when you cleaned it.
The purposes of the valve are:
To prevent run on (dieseling) when the ignition is shut off. This usually happens with an engine at operating temperature, shut off while engine is above idle speed.
It also is an emissions device to prevent unburned fuel from exhausting while the engine is coasting during shut down.
And it helps prevent exhaust backfire from unburned fuel entering the muffler during coast down.
What it does not do:
It only shuts off the fuel entering the main jet circuit. It does not empty the bowl. So it does not protect the carb from evaporating fuel during storage. Nor will it prevent fuel from entering the engine or spilling on the floor if the carb floods when the fuel valve is left on.
So, running the carb empty by turning off the fuel is the way to shut down for long term storage.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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