To all that furnished advise on how to cure a noisy stuck hydraulic
lifter, Marvel Mystery oil did the trick. I  added about a quart of
Marvel to the crankcase, and the
rest in the gas tank, took it out for a ride, and within 15-20 minutes
the engine was purring like normal again. That stuff really works. (no!
I am in no way affiliated with the marvel mystery oil people, or are any
members of my family).
Happy Camper!      "81 Westy (no name yet)

Mark Kazman