It's a small needle shaped part that is attached to the float by usually a pin or small spring looking thing. As the bowl fills w/ gas, the float rises, then at a certain point the valve presses up against it's seat and stops the flow. As you run it, gas level drops, then more gas is let in thru the valve and the process starts all over. The level of the float would be in the manual, but the adjustmentis correct when the gas level doesn't drop too far to starve the motor, but not too high as to flood it. Have the mechanic take a look at it.
Replacing the needle valve is easy, setting float height is more complicated.
__________________  The "other" ZZR rider.
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