I messed up the throttle of my motorcycle and it won't start now. I don't know how many times I turned it, but now I can't start it anyway.

It's okay. This is easy to solve. First of all, I tell you, you have to distinguish between intake valve and exhaust valve. The exhaust valve and carburetor next to the exhaust pipe are the intake valves. After knowing this, press the starting lever by hand first. When you see the intake valve going up and down, and the exhaust valve hasn't moved, you can adjust it. First, adjust the intake valve. The clearance is generally about 0.8 mm, so it doesn't need to be too precise. Almost enough. In other words, when you move up and down with your hands, you can feel a little active. Then adjust the exhaust valve as long as the clearance is larger than the intake valve. Needless to say, it's too professional. Good luck. Find a mechanic to adjust it later, and you can start it if there is no problem.