Typical issue is the pilot jet. Scooter carbs could be more primitive, but its the smallest one going from float to carb bore. If that is blocked it will present symptoms as you describe. Pull it out and blow through it then if you see daylight you are OK. Poking wire down it will likely make it too big so should be avoided.
Unless you really can't blow it clean. . .
But plug change is something you should always have spanner and spare on you to try if you have problems when out.
Don't you look at my accountant.
He's the only one I've got.
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