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same thing happened to me on my old 175 . . . now BFD's. Kept closing on the clearance, I kept opening it up. wound up that the valve seat had worked itself loose, and all hell broke loose. It ain't your valve, it's the seat. Pull the head, put in new seats, or get a new (old) head. Soon.
 

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HAH!! ! !! !

I told you it was the seat floating!! Didn't I! ! ! !

Usually pretty rare to have a problem with an intake seat. Evil, your bike was running a sloper 175 head....exhaust valve seats will drop out of them if they get too hot...usually because of poor contact with the head pipe or lack of a "finned" clamp of some sort. Very important to keep the exhaust port area as cool as possible as it draws the heat out of the exhaust valve seat.
 
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