My first entry into this most helpful forum is a 4 valve rocker cover question —on my 2012 registration Sport 1200 4V, as it happens— but the design is the same, yes?
Checking the tappets the other day (for the first time since I got the bike a few months ago) I removed each rocker cover to find that the metal spark plug tube came out as well —attached to the rocker cover. I thought, hmmm... didn't expect that . . . but OK.
Looking at the parts book, and this website later, it seems that the spark plug tubes sit inside the recess in the head casting and can be lifted out separately on their own.
So my question is: do any of you know if this is a later mod made by Mandello? Or is it a cunning mod made by the previous owner? Guarding against oil leaking into the plug recess, perhaps? Or have the tubes seized so firmly into the rocker cover casting that I thought they were actually made that way?
Riversider (in Scotland)