How to adjust the valve when the number of cylinders is marked on the camshaft?

First of all, you put the two cylinders of the first cylinder of the camshaft downward, and the positions are symmetrical, forming a capitalized & quot eight & quot word. That's on four cylinders, called the inner eight characters. On the contrary, if the cam of a cylinder rotates to two symmetrical upward positions to form a backward number 8, then the cylinder is called the external number 8.