What is the idle speed of a three-cylinder Le Chi engine?

The normal idle speed of a three-cylinder Le Chi engine is about 750 rpm. But some time ago, my Le Chi idled to around 1 100. As soon as I shifted gears and stepped on the clutch, the speed would instantly rise to 1500 to 2000 rpm. This consumes a lot of fuel and is not easy to drive.

I am free today. I took apart the throttle and idle motor. I found that the carbon deposition was not very serious, so I cleaned it up and reinstalled it. I lit a fire, but I still can't get off at idle speed. It suddenly occurred to me that I heard a netizen say every day that the plug of the idle motor can be removed and reinstalled when idling. I decided to try. After removal, the engine continues to idle. When reloading, the engine suddenly became unstable, just like stepping on the accelerator a few times, and then the speed slowly dropped to 750. During the test run, shift gears and step on the clutch, and the speed will not rise.