The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: motolaco1 on 08.09. 2025 08:51

Title: Help to check parts
Post by: motolaco1 on 08.09. 2025 08:51

Hello, i just bougt Bsa A7 from 1949, engine number ZA7 29..

Magneto(manual advanced) was out from motorcycle and i found that is missing magneto cam ring (I oredred from ebay) and also missing magneto drive gear with nut. I want to order but iam not sure if i choose rigt parts.
Can you please confirm i want order right parts?
Thanks
https://www.feked.com/manual-advance-magneto-pinion-drive-gear-bsa-a7-and-a10-models-alloy.html

and long or short nut?
https://www.feked.com/bsa-magneto-pinion-retaining-nut-long-type-for-a-b-and-m-group-models.html
https://www.feked.com/bsa-magneto-pinion-retaining-nut-short-type-for-a-b-and-m-group-models.html

Title: Re: Help to check parts
Post by: Swarfcut on 08.09. 2025 09:47

 Welcome to the Forum, looks as if your first post has a hint of trouble to come.

 The bike you have  by my reckoning started life as an A7 Longstroke, the engine of which which although sharing some parts with later engine types, the majority are not the same and care has to be taken selecting items that will fit.

 The magneto is certainly not original, early type had auto advance, not manual, and the Lucas date code is from June 1954. The nameplate looks to be too new to be original, so all may not be as it seems. Look at that clutch lever bodge.

 BSA  Part number for a fixed magneto pinion is 67 540, retaining nut  24 195. 

 This link will help.

   https://sites.google.com/site/priorymagnetos/spares-and-accessories

 To identify other parts, try this

   https://draganfly.co.uk/product-category/bsa/sparesparts-for-bsa-a710-b3133-c101112-m202133/

 Now head over to the introductions section and tell us all about how you got into this mess.

 Swarfy.
 
 

 

Title: Re: Help to check parts
Post by: Greybeard on 08.09. 2025 10:08

The label on the magneto looks surprisingly new🤔

Title: Re: Help to check parts
Post by: motolaco1 on 08.09. 2025 10:56

Magneto was probably rebuild...i have no info but spark works :)

Title: Re: Help to check parts
Post by: Rex on 08.09. 2025 16:40

Probably an original BSA spark then..

Title: Re: Help to check parts
Post by: muskrat on 08.09. 2025 20:42

G'day Motolaco1.
You may be our first member from Slovakia  *welcome*
Please go to Introductions https://www.a7a10.net/forum/index.php?board=13.0 and tell us your story.
The link to Priory magnetos will have all you need and advice to boot.
Cheers