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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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Lucas, Ignition, Charging, Electrical
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Changing the gear on Lucas 47503 Automatic Advance
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Topic: Changing the gear on Lucas 47503 Automatic Advance (Read 372 times)
Rien
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Join Date: Dec 2020
Posts: 30
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Changing the gear on Lucas 47503 Automatic Advance
«
on:
16.03. 2026 15:26 »
Changing the gear on a Lucas 47503 Automatic Advance (of a K2F on a A7, '54 Swinging Arm)
Hi all, small question: where can I find a loud and clear video for changing the gear?
Thanks in advance,
Greetings from Holland, Rien
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Greetings Rien '51 from Holland. A7 Swinging Arm '54
groily
Wise & Enlightened
Join Date: Jul 2007
Posts: 2150
Karma: 33
Re: Changing the gear on Lucas 47503 Automatic Advance
«
Reply #1 on:
16.03. 2026 17:45 »
Don"t know about a video, but this is the best description I know of if it comes through.
Thanks to Andrew at Priory Magnetos who does this stuf as well as or better than anyone on the planet:
https://docs.google.com/document/d/19LiHsh0ALtF7z0ttQZYofWhsS_3ZIsIv/edit
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Bill
Rien
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Re: Changing the gear on Lucas 47503 Automatic Advance
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Reply #2 on:
16.03. 2026 18:37 »
Merci bien Bill, thanks. Loud and clear info. I'am gone try. Greetings Rien
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Greetings Rien '51 from Holland. A7 Swinging Arm '54
Black Sheep
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Join Date: Apr 2017
Posts: 1290
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Re: Changing the gear on Lucas 47503 Automatic Advance
«
Reply #3 on:
17.03. 2026 06:50 »
Follow the instructions EXACTLY and it's simple. Good luck!
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2 twins, 2 singles, lots of sheep
Rien
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Re: Changing the gear on Lucas 47503 Automatic Advance
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Reply #4 on:
19.03. 2026 18:34 »
Thanks Black Sheep. See my next topic Lucas ATD with steel gear.
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Greetings Rien '51 from Holland. A7 Swinging Arm '54
Rien
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Re: Changing the gear on Lucas 47503 Automatic Advance
«
Reply #5 on:
26.03. 2026 09:51 »
Next question: the rivets in the ATD, are they steel, stainless steel or aluminium?
Thanks,
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Greetings Rien '51 from Holland. A7 Swinging Arm '54
chaterlea25
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Join Date: Jun 2009
Posts: 4439
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Re: Changing the gear on Lucas 47503 Automatic Advance
«
Reply #6 on:
26.03. 2026 11:58 »
Hi Rien,
3/16 inch diameter countersunk head steel rivits
John
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1961 Super Rocket
1963 RGS (ongoing)
Rien
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Re: Changing the gear on Lucas 47503 Automatic Advance
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Reply #7 on:
26.03. 2026 19:17 »
Thanks John. D=3/16" L= +/- 9/16" hard to get in Holland.
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Greetings Rien '51 from Holland. A7 Swinging Arm '54
chaterlea25
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Join Date: Jun 2009
Posts: 4439
Karma: 56
Re: Changing the gear on Lucas 47503 Automatic Advance
«
Reply #8 on:
26.03. 2026 23:39 »
Hi Rien,
Have you asked "De Groot" in Holland
There are plenty on eBay, but most seem to be in UK?
Try farm equipment shops locally, the 3/16 were used on a lot to secure cutter blade triangular sections
Alternatively ream the holes out to 5mm
or machine down 5mm ?
John
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1961 Super Rocket
1963 RGS (ongoing)
groily
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Join Date: Jul 2007
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Re: Changing the gear on Lucas 47503 Automatic Advance
«
Reply #9 on:
27.03. 2026 07:04 »
This may be heresy, but absent the correct items I have found that good quality steel wood screws with their countersunk heads and plain sections of the correct diameter (with the screw thread cut off obviously) make excellent rivets, are made of good stuff and peen over very nicely on the 'other' end. Have used them a few times for this with no mishaps and the results look pretty.
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Bill
Rien
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Re: Changing the gear on Lucas 47503 Automatic Advance
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Reply #10 on:
27.03. 2026 07:45 »
Thanks Bill and John.
Roeland, the owner of 'De Groot BSA' nowadays, doesn't have them. I can try on Ebay.
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Greetings Rien '51 from Holland. A7 Swinging Arm '54
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The BSA A7-A10 Forum
»
Technical (Descriptive Topic Titles - Stay on Topic)
»
Lucas, Ignition, Charging, Electrical
»
Changing the gear on Lucas 47503 Automatic Advance