The reason the parking generator damper does not adjust automatically is because the switch is loose. The repair method is as follows:
1. Open the valve chamber cover and you can see the intake valve and the exhaust valve. set screw.
2. Loosen the lock nut and turn the engine crankshaft to return the piston to top dead center. Then check if there is any valve clearance. If there is no space, turn the crankshaft to return the piston. return to top dead center again.
3. Adjust the 2-wire intake valve clearance and 3-wire exhaust valve clearance. Secure the screw nut.
4. Check the valve clearances again. Start the engine and listen to the valve head for any noise.