Not sure which owner before me but at some point the lock was drilling out. The guts are still there as well as the flap but it is inoperable. Tried to do a little research through Google and didn't find much. I use a krypto lock on the caliper when I'm out finding around and going to be parked for a while because it's easy to carry and at home I have a chain deal I run thru the wheel and down tube so I can sleep at night. I know it's not much of a deterant but it's a small bit of piece of mind knowing the head is locked.

which locks fits our S40 brake?? the disc has no holes for the usual ones?  any ideas on where to hitch it on the bike while riding if you don't have saddlebags?

I would suggest, (If you are in a area/neighborhood that you need to lock up).  instead of locking the bike only.
(2 people can just throw this in the back of a PU or Trailer, locked to itself or not)
Lock the bike, TO, something.

(People steal to sell parts..

When at home it goes in the garage with the disc lock on it. My concern was more for stop and go errands. And I'd just like to have a working head lock. I also have a chain system I use at times because I've had a bike stolen so I know the feeling. Walked out of the mall and it was gone.

Sometimes I think the more you try to prevent it from being stolen, the more attractive it is to the thieves.

Guess they figure if you don't care, it's not worth them stealing it unless they know for sure that they will get a lot out of the parts. (read chrome Harley)

Back when the first 900 Kawasaki came out, I worked at a Kawasaki dealer part time - I would go there after high school weekdays and on Saturday. I took bikes out of the crates and assembled them, put in fluids, test rode them (cool job for a high school kid....the Z1 and H1 bikes were hot!).

One the first bikes we sold went to a fellow that took that wonderful metallic brown paint, and sprayed over it with black primer.  He wanted a nice bike to ride...not one that got attention and looked like it was worth stealing.