These clutch plates, although of the same fitment as the earlier Norton type plain clutch plates (item 0255) are actually of the type sometimes fitted to original Manx Norton models. As you can see - they have slots in them to aid grip and help prevent warping.
Note that these type are an 'HD version' - in that they are slightly thicker than the standard thickness clutch plates (these being about 0.5mm thicker than the standard thickness Norton plain clutch plate. Note that we also sell the standard thickness Manx type clutch plate - see item 0251
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These clutch plates, although of the same fitment as the earlier type plain clutch plates (item 0255) are actually of the type sometimes fitted to original Manx Norton models.
The pattern of these clutch plates have been replicated exactly from original Manx clutch plates I have in my possession - I believe that this pattern was devised to slighltly enhance grip but also to reduce the risk of distortion under the additional stress most race bikes give the clutch (or a bit of both).
This 'HD' thickness clutch plate is an identical copy of an original plate taken from one of my race Norton bikes (these were fitted to my doubleknocker when I purchased it). As you can see from one of accompanying photographs, ours are identical in design and thickness to the original (but very burnt out now!) original plate. Over the years I have seen this type of plate occasionally fitted to original racing clutch's . . . but to my knowledge they have not been available to buy new for many years.
I have seen this style of clutch plate in both standard thickness (our Item 0253) or this slightly thicker thickness (approx 0.5mm thicker than standar) - I am not sure if that was intentional (or just different original batch's) . . . but this slightly thicker clutch plate may well lend itself to Cooper Car racing (where a Norton clutch is used), grasstrack and spring racing - or sidecars. They can of course also be fitted to roadgoing Norton Models!
These plates have inner tongues of 0.290" width - Please check you clutch before ordering, as it is not always obvious which type of clutch plate is fitted. Manx clutch's were normally fitted with 4 plain plates as standard, while road bikes were fitted with 5.
We lightly linish each clutch plate to remove any burr marks or edges resulting from laser cutting (and and sharp edges from occasional scratchs that are inevitable with large lasercut items) - and as well as being purposeful for a competition clutch, look very unusual and distinctive.
You will see in the photographs, they have been fitted here to an original 1930's racing clutch (which also has 'new old stock' solid Ferodo friction plates fitted) - but should fit all Norton clutch's pre-amc, including road going clutch's if required
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