Vintage BMW Motorcycle Owners

Can't 'mem proper term, but it's self locking by a smooth smaller diameter that's been compressed to squeeze the threads.

Hi, 3 years later, problem found !! Idiot mech put 3 of the right side head nuts on BACKWARDS ! The locking side of the nut is ~.060-.070" high and of a much smaller diameter. Running the engine progressively "mushroomed" that smaller diameter, so the valves opened up. Resetting just ...

Thanks for the clarification, seats vs tulip. Indeed the clearances tightened dramatically and in a short time. What I don't get is, wouldn't the valve stick significantly further into the cap area, I mean noticeably? Or are the distances too small enough to see. I'm still caught up on the one washe...

I have a '74. A Lot (20+) years back my mechanic pulled & reput the heads, can't remember why. Shortly thereafter, both right side rockers were so tight as to cause mis/back firing. Mech reset them, but problem returned within 10 miles. Reset again, returned again except this time it broke both ...