A lot of auto mechanics get thrown when hooking up the throttle on a governed engine.
When you push the throttle control it stretches the red spring
The red spring should be connected to the governor arm, which is the lever with the 3 numbered holes.
The other end of the governor arm has the link rod that goes to the throttle butterfly.
When you move the governor arm in the direction of the spring pull it should open the throttle butterfly fully.
In use the governor arm trys to CLOSE the throttle not open it.
At rest the governor is also at rest so it allows the throttle to be fully open.
As the speed increases it trys harder to close the throttle and that means it has to pull against the spring.
This particular set up is confusing because it is universal and made to take left or right hand controls.
So start by taking the air filter off and make sure that the butterfly is fully open with the engine at rest .
If not loosen the cable clam and move it till the butterfly closes.
On the carb itself the throttle butterfly might have more than one hole for the throttle rod, one for push to open & one for pull to open.
Get the manual Mark has linked to and read the section os "setting the governor" 3 times, prefferably which a cup of coffee and not a few beers.