There might be an issue with the throttle plate, but it is probably not the issue causing the engine not to start.

Is the fuel a few months old??? Old fuel is difficult to start, and will probably burn poorly until the engine is hot.

Have you tried starting the engine using starting fluid?

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
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The Carburetor Shop