As for the valves, "threaded post with lock nut type adjuster".
I have over 40k and the bike looks and runs better then new.
I've only replaced the normal stuff. I run high revs all the time, ride all year around, and I know I'm hard on the clutch. Tires, chains, sprockets, spark plugs, oil, and filters, and some gas, thats all it ever needs. I did a few other upgrades but I didn't have too!