Inner Clutch Hub Wear

Hello All, Can any one tell me how much wear is permissible on the inner clutch drum (notching worn by the plates) before it is noticed in the action - on the one I've been sent from E Bay I have measured 0.010". Cheers

This one has around 0.020" deep notches, and is considered to be badly worn (the worst example that one of our members had ever seen, apparently!) and it was causing some drag when the engine was started from cold, so 0.010"means yours is probably already rather worn, but is it in better condition than the one that's fitted to the bike? If not, then I hope you didn't pay too much for it?

Are you running bronze plates? Those are the ones' that usally causes this issue.
You can run just fine the way it is for awhile. I would keep an eye out for a good used center.
If you are keeping the bronze plates, if that's what you have, a hardened clutch center is available out there. If you get a standard center, surflex or Barnett plate may be in order.
FYI
You can get the standard center and the surflex plates for the price of a hardened center alone.
Bronze plate are less suseptable to oil contamination.
Surflex are much lighter and very smooth action.

If the bronze plates are used with the earlier non-hardened clutch center then maybe you can get this kind of wear. They are meant to be used with a hardened center - rings like a bell when you flick it. I just looked at mine last weekend and there was a shiny spot but wear was very minor after 20K miles and I have not noticed any drag problems.

batrider said:

If the bronze plates are used with the earlier non-hardened clutch center then maybe you can get this kind of wear.

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I would certainly think so, as the clutch centre shown in my photo is a hardened one!

I purchased a new inner hub to complete the primary on my Mk III last year, the best price I could find was $125 (highest $220); I called or surfed a lot of vendors, none told me that I had a hardened/non-hardened option. I would think that you would want the hub to be harder than any plates you would fit, no?

RS

RoadScholar said:

I called or surfed a lot of vendors, none told me that I had a hardened/non-hardened option.

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I don't think there is an option?

The pre-bronze plate clutch centres (so presumably the non-hardened type?) were part number 060743.

I don't think that particular part has been available from Andover Norton for some years as I believe it was discontinued when the hardened centre was introduced, and that part number is "not found" in a part search of the AN website, so any 060743 centres still available are likely to be old stock-unless somebody else is making them, as the '73-on (bronze plate, so presumably-hardened?) clutch centre part number 063979 is still the same today, and is the standard replacement part for all Commando clutch centres.