What is the function of the valve train assembly?

[Wren]

The function of the valve train assembly is to ensure the intake and exhaust valves open and close according to the timing specified by the valve timing, while maintaining sufficient valve lift. The main components of the valve train assembly include: valve timing gears, camshaft and its components, rocker arm shaft and rocker arm assembly, valve pushrod, valve, cylinder head, valve seat, valve guide, valve spring, valve lock piece and its components, and valve adjusting screw parts. The steps for cleaning the valves are: 1. Loosen the fastening screws of the air filter and throttle body; 2. Open the engine cover; 3. Remove the engine trim panel; 4. Remove the intake hose; 5. Remove the throttle body, block the intake passage, and clean the throttle body; 6. After cleaning the throttle body thoroughly, add engine oil.