How to adjust the valve of motorcycle horizontal cylinder engine?

Open the generator side cover on the engine side, usually like a big screw. There is a smaller cover on the cover, which can be removed with a screwdriver. Find a sleeve (like 17) and insert it into the side cover to turn the crankshaft. The simplest way is to remove the spark plug, insert a thin stick in the cylinder, turn the crankshaft here, feel the top dead center of the piston there, and open the valve adjusting cover. If the valve is still a little tight at the top dead center, you can turn the crankshaft 360 degrees, which is the best adjustment position. As for how to tune it, it goes without saying, remember to warm the car.