Hello, my name is ***** ***** I am going to assist you with this.
From what you are describing, it does sound like you have a bad governor.
Here is the easiest way I know to explain it.
When the engine is not running, the governor spring holds the throttle in the wide open position.
When you start the engine, the governor (which is a centrifugal weight inside the engine) starts spinning.
Centrifugal force pushes a weight outward, exerting pressure on the governor shaft, and turning it.
The governor arm is connected to the governor shaft outside the engine, so the governor arm also moves.
The governor actually tries to slow the engine down.
The faster the engine turns, the more pressure that is put on the governor shaft/arm.
The point at which the force of the governor (trying to slow the engine down) equals the force of the governor spring (trying to speed the engine up) and keeps the engine running at a steady speed, is called the governed speed.
With this in mind, here is how to check the governor.
Manually move the governor arm/throttle lever back and forth between the stops. Note how much movement there is, and also how much tension is on the governor spring.
Remove the spring from the governor arm.
Move and hold the governor arm/throttle to the middle position, and start the engine.
Slowly move the governor arm to slow down and speed up the engine.
Remember, if the engine is allowed to run too slow, or too fast, the engine will shut down.
As the engine speed increases, you should feel the tension on the governor arm increase, and as the engine speed decreases, you should feel the tension on the governor arm decrease.
If you feel no tension at all, the governor is likely bad,and the engine will need to be torn down to check it.