Norton MK3 fork lock

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nortonisthebest

nortonisthebest

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Aug 1, 2014
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Hello,
I don't have a key for my 1975 Norton MK3 front fork lock. Does anyone know how to get a replacement key or how to remove the key lock cylinder from the yoke. There is a pin that is holding it in place. How do you remove the pin to take the cylinder out?
 
Not sure if the Mk3 is the same, but you can VERY easily push the whole cylinder up and out, on my bike.
 
Mr. Rick said:
Not sure if the Mk3 is the same, but you can VERY easily push the whole cylinder up and out, on my bike.
Click to expand...

The Mk3 steering lock is retained by a pin and has to be pushed out in the downward direction.
 
The hole isn't drilled all the way through where the pin go's. If it was I could use a punch to remove it. Not sure how I can push it out in a downward direction?
 
I wonder how many different keys were made for the MK3 fork locks? If I could find someone who has a MK3 and try their key to see if it would fit my MK3 I might get lucky and it will work. If this won't work I would hate to have to drill out the split clevis pin to remove the lock cylinder sense the pin is hardened steel.
 
nortonisthebest said:
The hole isn't drilled all the way through where the pin go's. If it was I could use a punch to remove it. Not sure how I can push it out in a downward direction?
Click to expand...

Yes, the pin can't simply be punched out, sorry if I didn't make that clear in my previous post.


nortonisthebest said:
If I could find someone who has a MK3 and try their key to see if it would fit my MK3 I might get lucky and it will work.
Click to expand...

It's also the same type of key BMW used on their 70s & 80s airhead twins and 'K' models.
 
L.A.B. said:
Yes, the pin can't simply be punched out, sorry if I didn't make that clear in my previous post.

It's also the same type of key BMW used on their 70s & 80s airhead twins and 'K' models.
Click to expand...

Here's a photo to compare. The 1972 Made In England and 1975 Made In Germany. (Pre-Unification)

Norton MK3 fork lock
 
Thanks for the information.
It looks like the pin will have to be drilled out and then replaced with a new cylinder with keys. I just hope I don't brake the drill bit off while drilling it out.
 
The MKIII key is also made of steel. I imagine to help prevent it from breaking off in the lock. Some locksmiths would probably avoid cutting that key on their machine as most keys are brass or nickel-silver. The steel key could ruin a good cutter.
 
I replaced my MKIII lock but unfortunately I don't remember the steps and I'm on the road. I won't be home until 1 July but I'm sure it will refresh my memory if I have a look at it. I do recall the pin is blind but I don't recall drilling it.

Sorry to be of little help at the moment.
 
Just looked at my MKIII and the pin is on the right (throttle) side and it looks like it has to be drilled out or pulled out before the lock can come out.
 
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