Magneto pinion nut

[Grandad Russ]

Hello all
New member here, some advice needed if poss.
B31 magneto pinion nut required for my build. Two types listed.. Short sleeve and long sleeve. Any advice please on which to order. Ta. 😁

[Bess]

Hi,
    I can only find 1 nut. Its for years 1937 to 57, part number 24-0195, the other years its a circlip.

Best wishes...

[JulianS]

Short sleeve and long sleeve nuts usually refer to the central nut which goes into the automatic advance pinion for twin magnetos.

Bess has identified the nut you need which was also used on twin magnetos with manual advance. Image is from the A10 parts book. Ignore the leading number 111 which is just a price code used by the factory.

[Grandad Russ]

Gotcha, 24 - 195 is what I had written down. I'll order one off Feked tomoz. 😁
Thanks all.

[Grandad Russ]

Oops, just been on the feked website and they list a short sleeved and a long sleeved nut with the same 24-0195 part number. Really confused now.

[JulianS]

The Feked nuts are long or short shouldered type, which is what you need.

Not to be confused with the auto advance unit sleeve nut which you can see at the bottom of the photo.

[Grandad Russ]

Cheers Julian, but which do I need.. Long or short shouldered? Ta. 😁

[Pete C]

searching on the Draganfly site gives:

24-195  long sleeved nut
24-0195  short  variety.

I have 3 bikes with Magdynos and all have the short version holding the pinion in place.

[Bess]

Hi,
     I'm believe 24-195 and 24-0195 are the same, however follow the links in Draganfly site, 24-195 on the drawing, 24-0195 on the text?:

https://www.draganfly.co.uk/product-category/bsa/sparesparts-for-bsa-a710-b3133-c101112-m202133/engine-gaskets-gearbox/timing-gear/pre-unit-b-m-group-gear/

Shows short, the image of mine attached demonstrates a small nut will suffice. A longer nut might foul the casing.

To cover all eventualities buy a long one and cut to size.

Best wishes...

[Pete C]

If you do cut down a long nut (which you don't have to do if you get the correct short one  )  make sure it is cut square. I would say a lathe is the best way to do it.

[Grandad Russ]

Thanks all for the replies, much appreciated.
I've ordered the small sleeve nut from feked. Six quid with p and p. Thanks again all. 😁

[Pete C]

Now the real fun begins..trying to tighten that nut without disturbing the timing! 

[Dennis49]

I find that if you lap the gear to the shaft using fine valve grinding paste and tap the gear onto the shaft when the timing is correct. It should not move. You can also use solvo autosol instead of grinding paste.