How to correct the AC300 speed correction?

Open the choke valve fully, and then slowly loosen the throttle limit screw to reduce the throttle opening and reduce the engine speed to the lowest stable speed. Adjust the idle speed adjustment screw to increase the engine speed as much as possible. Then slowly loosen the throttle limit screw to reduce the engine speed to the specified minimum stable speed (about 800-900 rpm). This repeated adjustment can adjust the throttle opening to the minimum.

Security risks:

The reason why the engine speed is unstable is that there are some problems with the spark plug. It may be caused by carbon deposition after too long use. At this time, we can remove the spark plug.

Heat it in the fire, then use cotton or brush to remove the carbon deposit around the spark plug contact, and then install the spark plug normally. If it really doesn't work, it may be that the service life of the spark plug is up and it needs to be replaced with a new spark plug.