'73 Commando standard counter sprocket.

Sorry quawk,
I was thinking the IWIS chain sold at AN was the M106SL, which I have. These are made in Germany and I bought from Andy Chain. I think his son runs the business when he retired.
I think the ELITES are made in chyna???
The IWIS M106SL are 0.0625" plate thickness, 0.662" across the flats (Outer plates), 0.758" @ the rivets or pins, so the widest point where it runs between the primary and gearbox window.
here is an old thread when Andy was active on this forum.
www.accessnorton.com

Final Drive chain

I'm hoping somone can clarify something for me. I recently got my '72 Norton Commando 750cc motorcycle up and running after purchasing it last Fall. After Changing out the old fuel and cleaning out the carbs and lowering the idle (with the help from past post's on this site) I finally went for...
www.accessnorton.com www.accessnorton.com
Good information.
 
L.A.B. said:
I think Jason bought the business from Andy. Their surnames are different so I don't think they are related.
Click to expand...
Are you sure?
I thought they both had "Chain" as their surname?
And that it ran in the family!
Certainly had many links 🤔🤣🤣🤣🤣🤣
 
baz said:
Are you sure?
I thought they both had "Chain" as their surname?
And that it ran in the family!
Certainly had many links 🤔🤣🤣🤣🤣🤣
Click to expand...

Yes, alright, you've said that before.
www.accessnorton.com

Drive chain

Well folks , I have small issue with chain rubbing against primary cover , lots of movement sideways on the chain I am going to buy new chain what do ye recommend I think the one is on it is very heavy duty and no need for it , as for rubbing against primary I think it’s only started last couple...
www.accessnorton.com www.accessnorton.com
 
L.A.B. said:
Yes, alright, you've said that before.
www.accessnorton.com

Drive chain

Well folks , I have small issue with chain rubbing against primary cover , lots of movement sideways on the chain I am going to buy new chain what do ye recommend I think the one is on it is very heavy duty and no need for it , as for rubbing against primary I think it’s only started last couple...
www.accessnorton.com www.accessnorton.com
Click to expand...
Oops sorry
Old age is creeping!!
 
L.A.B. said:
Yes, alright, you've said that before.
www.accessnorton.com

Drive chain

Well folks , I have small issue with chain rubbing against primary cover , lots of movement sideways on the chain I am going to buy new chain what do ye recommend I think the one is on it is very heavy duty and no need for it , as for rubbing against primary I think it’s only started last couple...
www.accessnorton.com www.accessnorton.com
Click to expand...
Blimey, I can't even remember what I had for breakfast!
 
quawk said:
Now that I've counted the sprocket teeth and chain links and ordered a new 530 chain, it looks like in some past postings that some members have indicated that they have had trouble with "regular" 530 chain rubbing on the case, after installing new chain. Have also now read where a member says that the chain that Andover Norton sells is a "narrow" 530 chain and allows a bit more clearance. Can someone weigh in here and tell me if that is the case, and may I have a rubbing issue after installing a new chain.
Click to expand...
Unless your bike is mis-assembled, a standard 530 chain will not work - at least the master link will hit something and a heavy duty 530 one will never work. You can install the master link of a standard 530 chain outside in and dig a groove in the gearbox that won't hurt anything unless it catches and locks the rear wheel. Installed inside out (normally) will catch on the seal plates of the inner primary.

People mentioned Andy and AN. Although the links are 5/8" and the width is 3/8" they are not 530 chains - they are correct chains for Vintage British motorcycles: 10B-1.

Some people in other universes are about to pipe in and say they run o-ring or x-ring 530 chains - hope you can find that universe to live in :p

Details: https://gregmarsh.com/MC/Chains.aspx
 
marshg246 said:
Unless your bike is mis-assembled, a standard 530 chain will not work -
Click to expand...

Does anybody know what this means (other than the probability that I got it from somewhere where it was incorrect).

1717280534452.png


It's from the 750-850 Workshop manual and I can't make any sense of it.

Here's the Rider's Manual info:
'73 Commando standard counter sprocket.


​
​
​
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​
​
 
Last edited:
Blewdy Yaink said:
Does anybody know what this means (other than the probability that I got it from somewhere where it was incorrect).

View attachment 114689

It's from the 750-850 Workshop manual and I can't make any sense of it.

Here's the Rider's Manual info:
View attachment 114690

​
​
​
​
​
​
Click to expand...
It means, five grand in width is a "DMF" in this instance.

530 is a match.


Cluckers & rivet counters cling to a bygone industry standard, for no reason. Be glad we have inexpensive chains that work great.
 
Blewdy Yaink said:
Does anybody know what this means (other than the probability that I got it from somewhere where it was incorrect).

View attachment 114689

It's from the 750-850 Workshop manual and I can't make any sense of it.

Here's the Rider's Manual info:
View attachment 114690

​
​
​
​
​
​
Click to expand...
The first part is the primary up to the last line. The last line is probably a typo. 0.400 is not 5/8" (0.625"); 0.380 is close to 3/8" (0.375) so may be an actual measurement for nominal 3/8" I never noticed it before and the MK3 manual is the same.

The first part of the second image is correct, AFAIK. It's a 3/8" between pins chain, 1/4" wide, three rows.

The second part or the second image is the confusing part. The distance between pins for a 530 and aa 10B-1 chain is 5/8". The width between the plates is nominally 3/8". However a standard 530 chains' overall width is larger than a 10B-1 and this is especially true of the master link. It's because of two factors. The actual width between the places of a 520 is a little more than a 10B-1 and the thickness of the plates and therefore the length of the pins is more for a 530 than a 10B-1.

So the rider's manual is correct, but for 50+ years ago when the British used the 10B-1 type chain. Today there are many types of 530 chain: standard, heavy duty, o-ring, and x-ring. at least. None of those fit a Norton or Triumph (in most cases).

It's much like you'll see in the manuals that you are supposed to have a 35 amp fuse - that does NOT mean a AGC 35 or SFE 35!! A decent replacement is SFE 20.
 
L.A.B. said:
0.400" (10.16mm) appears to be the roller diameter.
www.fbchain.com

10B-1 Roller chain | FB Chain

10B-1 Roller chain made to ISO R606 is 5/8″ or 15.875 mm pitch it is available in single strand 10B-1 duplex 10B-2 and triplex 10B-3.
www.fbchain.com www.fbchain.com
Click to expand...
IMHO, a strange thing to list in a workshop manual, but I think you are right.

Also, the width between plates is shown as 9.65mm (0.380") which is 0.005" larger than 3/8" so it makes sense that 0.400" diameter, 0.375" length rollers would be used in a nominal 5/8" x 3/8" chain.

The ISO 10190 (530 chain) roller is 0.400" diameter and 0.375" length as well. The big difference to 10B is the plate thickness and pin length, especially those of the master link. Heavy duty, AFAIK, is not covered by that standard - just has thicker plates and therefore longer pins. The same for o-ring and x-ring chains. A 520 x-ring chain is almost as wide overall as a standard 530 chain!
 


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