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Taking out the spark plug and trying to "start it" isn't achieving anything. All you're doing is creating an air pump and pushing air out of the cylinder.
Now if the engine was running fine and just refuses to start after you shut it off. Assuming you have compression. For the engine to start, you need 3 things, fuel, air and spark. If it's not starting, you haven't got one of those things. Take the spark plug out and leave it attached to the lead, place the plug against the engine and pull the starter and look for spark. If you have a decent spark - that's not your problem.
Next is to look for fuel. Put the plug back in and try and start it. After a few tries take out the plug and see if it's wet. That will tell you if it's getting fuel. If it's completely saturated! Then you may be getting too much fuel and "flooding the engine". So if it's dry, or if it's soaking wet. Take the carby off, take it apart, and clean it thoroughly (use carby cleaner). It may be blocked not letting fuel in, or it may be jammed and just pouring fuel in (flooding it).
Give those a shot and let us all know how you go. My gut feeling is you've either got a dead spark plug (OR, the kill switch is rooted and it's engaged full time). Or your carby is blocked.
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