It is difficult to start the motorcycle after adjusting the valve.

Start the engine to warm up the car first, then stabilize the idle speed at 1500 rpm, screw the mixture screw to the end, then quit for two turns, fine-tune the left and right half turns until the idle speed is the highest, and then adjust the idle speed to 1500 rpm, so it is almost the same to repeat it twice. You should adjust the concentration of the mixture, not the valve. If it is difficult to start, check the valve clearance and the combustion of the spark plug, and clean the carburetor if necessary. The concentration of your mixture may be adjusted too thinly. The mixture screw of this carburetor thickens when it is screwed in or diluted and pulled out.