The cylinder head is made of aluminum and has wedge-shaped combustion chambers. The spark plug is located in the center of the combustion chamber. The intake and exhaust valves are located at a sharp angle of 22.5°, which ensures a compact cylinder head. The small diameter inlets are arranged vertically. The amount of valve guide protrusion into the intake port has been reduced by reducing the valve stem diameter and valve guide outside diameter. Bolts with a tightening torque in the plastic zone are used to fasten the cylinder head to ensure good axial tension.