Fast Eddie
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- Joined
- Oct 4, 2013
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So, your old one pre-dates the new harder wearing type… and it still lasted 10 racing years !Norman uses a Commando centre as a base for his. That means to me that he gets them from AN. The one I have predates 2016 by a couple of years, my clutch was built in 2014.
The modifications firstly remove the dependence on a standard Commando mainshaft circlip. Essentially a washer is welded to the centre and is clamped by the but onto the mainshaft end.
In my application with a TTi mainshaft I don't think this approach is as necessary, since the mainshaft has a step to it's larger diameter and that step normally retains the clutch centre.
The other part is a little more critical to clutch function. Norman puts a spacer inside, between the clutch centre and the clutch drum bearing. Suitable sized to ensure engagement of the friction plates on to the centre. This is required to ensure the proper engagement of all of the friction pales with the centre and I understood from Norman that the spacer thickness and therefore new circlip groove location may vary between applications. Depending on the application Norman uses 3 or 4 friction plates as required by the specific bike and intended use, basically I guess it depends how much power the clutch is handling.
Mine is a race bike and has 4. This spacer affects the installation of the centre bearing retention circlip, so he machines a new groove based on the required location.
If I use a standard clutch centre I most likely would need to machine a new groove as required.
The harder the centre, the harder this groove will be to cut. I suspect on a CNW item in particular, it would need to be ground.
Your fix seems simple to me Steve… send your old one to Norman and ask him to make a new replacement. Add in new clutch plates for good measure at the clutch will most likely out last your racing career …!