Yes, there is, there's an upward-facing bolt with a lock nut on it on top of the governor that sets the high speed limit. Screw it "in" and forward throttle lever motion and high engine speed is limited, screw it out and the throttle lever will be able to move farther forward and engine high idle will increase.
The two levers on the governor are not directly connected, some "lost motion" between them is perfectly normal.
There's not NEARLY as much "magic" involved in basic governor action as some would like to have you believe.
The governor spring tries to pull the carburetor throttle butterfly wide open as soon as the throttle lever is advanced, centrifugal force acting on the governor weights counters that force and tries to close the butterfly. For a given throttle lever setting, the engine speed at which those two forces are equal is the speed at which the engine will run.
If the engine won't rev up at all with the advancing of the throttle lever, the spring is likely broken or disconnected, if it won't quite reach "rated speed" the spring may have stretched/weakened a bit with age, which in my experience is not as common as some others say, but possible.
Putting the spring aside, most other governor issues will either cause a slow governor response to "pick up the load" or engine "runaway" if there's a failure in the area of the weights or weight fingers, the thrust bearing and sleeve, or the "governor fork".
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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