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#861958 10/29/21 9:25 pm
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I have heard that there are pips on the back of clutch spring nuts which hold these nuts in position. Could someone post a picture of what these pips look like?

Thank you in advance,

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The NEB clutch on my race bike is similar to old brit bike clutches but made of aluminium. It has no "pips", the clutch hasn't been touched in 3 seasons. Drag racing is brutal on clutches
I wouldn't worry about "pips"


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Thanks Andy. My old clutch spring nuts are brass and all I can find are steel. I am curious as to whether steel is ok.

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I made screws for my clutch with hexes I could put a socket on, sick of struggling with the screws. No pips never undo themselves just work.


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the pips on my original brass clutch nuts
were just pin-punch marks , made from one adjustment slot
that made a distinct raised nipple on the inside .

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The pips are there to keep the nuts from backing off. The pips catch on the end of the spring when the nuts are backed off. But I've used clutch nuts that had the pips sheared off, and none of them have ever loosened.

What's worse when backing off the nuts (with pips) is ruining a clutch spring. I learned too late that this can be avoided by pushing in against the spring with a screwdriver when backing off the nut.


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Here's an example of a clutch spring nut with the pips underneath the head (with acknowledgement to British only Austria) who are selling it, you can just about see the pip on the rightmost nut.

[Linked Image from vintage-motorcycle.com]

Generally these clutch spring nuts were used on unit singles such as BSA C15's. B40's & B44's, the idea was to stop the nut from turning and loosening, it didn't work very well.

A later modification was to drill a small hole through the side of the head so that two nuts could be locked with each other. This proved much more successful and is what I use on my B44 and I think what was used as standard on B50's.

Last edited by gunner; 10/30/21 4:28 pm.

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Originally Posted by Mark Z
The pips are there to keep the nuts from backing off. The pips catch on the end of the spring when the nuts are backed off. I learned too late that this can be avoided by pushing in against the spring with a screwdriver when backing off the nut.

EVERYONE should be aware of this- not compressing the spring as the nut is backed off grinds the pip down in no time- rendering it worthless.

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Pips or no pips, I have never had these nuts back off and never bothered to wire them.

Mr Mike

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Originally Posted by Mr Mike
Pips or no pips, I have never had these nuts back off and never bothered to wire them.

Mr Mike

Same here.


Amateur Loctite enthusiast.

Moderated by  Allan G, Jon W. Whitley 

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