Keys

[adespin]

  I have used these in the past for my Yamaha Townmate, fast service.
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwiql7nmwrnpAhWlSxUIHY-UAzQQFjAAegQIBxAC&url=https%3A%2F%2Fkeysinthepost.com%2F&usg=AOvVaw08zl4JLnJCWWhmd2XYDGeX

[cooleronthecoast]

That looks promising, not original blanks, but at the moment I just want a decent spare key that works in case mine breaks.  Thanks Ade.

[cooleronthecoast]

I've ordered one from Keys in the post, I'll report back when it lands, thanks again for the tip Ade.

[adespin]

  My pleasure,

  where would we be without the internet!

[Bryanj]

Looking at kin big phone bills from calling firms up and waiting

[JezzaPeach]

Just in case useful, my cb500/4 was claimed to be an Italian import and had a different steering lock with a metal cover held on by a brass stud and I replaced the head stock with a UK one so I could replicate my old bike setup and bought all 3 locks/ignition new, with 2 new keys.
After seeing your post I came across the eBay ad in the attached pic which seems to come from Italy. So that might explain what the steering lock is about, unless the UK 550 was different again. May be of use if that’s what yours is like and has no key.
On the main key front maybe not impossible to get a couple of blanks and have a go!

[Bryanj]

Thats the Neiman lock in the side of the headstock instead of on bottom yoke and is what a lot of later Hondas used. Back then you could not buy keys or get them cut if lost you had to drill out and replace lock

[cooleronthecoast]

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The key arrived today and fits perfectly.    Did you get your key number sorted out Simon?

[SPR]

Did you get your key number sorted out Simon?

I've decided it is 318 .. so will be ordering one