Hi all, I finally decided to sort the oil seep from the inspection covers on the 79 CB650z due to the PO having stripped the threads. So 2nd hand cyl head cover bought c/w tappets in place. After tarting it up and fitting it I go to set the clearance. Now I can set cyl 1 ,3 + 4 fine but cyl 2 I just can’t get any movement on either tappet at the respective 1.4 T mark even with the adjuster backed right off. I’m at a bit of a loss as to what’s wrong so any suggestions greatfully received