What are the typical symptoms and mechanical consequences of having valve clearances (tappet clearance) that are adjusted too tight?

1. Hard starting when hot, loss of cylinder compression, and potential burning of the valve faces and seats.
2. Excessive mechanical clattering noise from the cylinder head and increased valve lift.
3. The engine running extremely rich, producing black smoke, and spark plug oil fouling.
4. The drive chain slipping off the sprocket and engine oil pressure rising excessively.