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Perhaps the tappet clearances were a bit wide before.
But it may be as simple as tappet noise escaping from a leaky exhaust seal.
The tappet adjuster would stick out and look odd, so I had some more thinking to do.
Removal The first task is to remove the crankcase breather from the tappet chest side of the engine.
Pre 1977 1/2 model year bikes used a unique thread size for the tappet block hold-down screws.