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D7 & D10 - where do the horns and ignition coils go?
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Dermot Bambridge
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February 1, 2021 - 10:18 am
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Hi I'm Dermot and a new Bantam Club member,  

First my questions -

Where are the horn, the ignition coil and the rectifier mounted on a D7 and D10?  A couple of photos would be the simplest reply if that's possible.  I can find zillions of Bantam pix but none seem to show what lies beneath the saddle in any detail.  I am also trying to get hold of the adaptor ring that the air filter clamps on to, on the 375/31 Monobloc carburettor if anyone can point me in the right direction?

Now the boring bit (but not for all of you I hope) - a bit of an introduction to you if that's OK? 

As I am having my Covid vaccination on Friday, that might tell you that I am no youngster but I was when I had my first Bantam back in the 1960's.  It was a bitsa with a 125 engine and plunger frame.  I never did get it sorted properly but concentrated on a 1930s Norton 350 I had been given, as well as a 197cc Coventry Eagle - both of which I used to ride on a piece of rough ground next to our house.  Since then, I have worked in the automotive and motorsports industries all my career and maintained a workshop (shed mainly) full of bits of bike and old cars.  I bought the D7 as a rusty box of bits off eBay for £205 about 15 years ago and then bought the D10 for spares shortly after.  The D10 turned out to be in better fettle than the D10.

Fast forward to last year and due to part retirement and part lockdown I was restricted to 'barracks'.  The weather was great and my two-wheel instinct awoke.  In the shed were a 1929 BSA H29 with sidecar (for ladders; it originally belonged to a window cleaner), a 1956 BSA B31 I bought 'mainly restored' 10 years earlier and the two Bantams.  The H29 I had restored in the early 90s but not the sidecar.  I decided to do that first, which I did.  The B31 was next as it was complete but I had never had it running.  I assumed that it was in goodish order but when I took out what should have been a short reach spark plug and found a long reach one my confidence waned.  So with the side car tucked away, a complete strip down confirmed that the B31's rebuild was not done properly.  Had I got the bike running, disaster would have resulted.  With the B31 looking close to new, my attention turned to the Bantams.  Tempted as I was to do the two in parallel, I decided to do the D7 first.  I had rebuilt the engine some years previously and it sat on the bench - more as an ornament than anything else.  The D7, as mentioned, was a box of bits, which had been in a big plastic box, which at some time must have been full of water because some of the bits - the fork legs in particular - were very rusty.   However I grit blasted (part professional and part my own smaller machine) away paint and rust and started restoration.  There's still a long way to go and thanks in particular to Feked in particular (I am surprised I can't find them in the club guide book) the phoenix arises.  I have all the parts books but some of the bits are not shown in them.  Hence my query as to where certain bits should go).

Thanks for you patience if you got this far and I'll send in some photos when the bolting together gets under way.

Best regards,  Dermot

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GlenAnderson
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February 1, 2021 - 10:47 am
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Hello and welcome Dermot. 

Sounds like you have a nice assortment there. Sorry I can’t help with the underseat arrangements, but my expertise lies with the earlier machines as far as cycle parts go. I’m sure someone will be along shortly with some pictures for you. 

Speaking of pictures, it would be great to see some of your machines. I had an M33 for a number of years, and have quite a soft spot for BSA pre-unit stuff. 

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Stoo63
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February 1, 2021 - 11:00 am
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Hello Dermot and a very warm welcome to the Club and the Forum. As Glen says, nice selection of bikes you have there. Thanks for the intro; it makes life easier for other users. 

You will find just about everything you could ever want on the Forum via the FAQs and technical sections;  ** Please log in to view **

Have a really good nose around the forum and enjoy yourself. Looking forward to seeing your progress.

Good Luck!

All the best,

Stewart

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '91 GTR 1000;  '97 Honda Sky SGX50.

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sunny
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February 1, 2021 - 11:54 am
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hi  Dermot     a  small  bit  of plasick  wast   pipe  and  tape    will get  the  air  filter  on  for  now   so you can  get one  later   the  HT coil  , horn & rectyfier   dont  go  in  the same  place  for  all  modles          &  BSA  didnot   usly  have  bolts just  for  them  thay  dend to   piggy  back  on  something  else   thats  wy  its  not     ezy   to  see  wer  thay  go     try the  coil  &  rec  on the  mudgard &  cross  bar  of  the frame  the  horn  is  usely   up the  frunt  end of  the  seat    c/u  later

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stubaker58
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February 1, 2021 - 1:07 pm
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Hi Dermot,

As Sunny says the coil goes on a bracket that fits onto the top of the mudguard.

Try Hitchcocks Motorcycles, the Enfield dealers, for the carb ring, I think they have them.

Regards,

Stuart

“There’s nothing new under the sun”.

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rhi010
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February 1, 2021 - 8:11 pm
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Hello Dermot, was it Scania where you worked ? and one of the custom car magazines in the 1970s i seem to remember.....

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Sponge
Lancashire (A chip shop somewhere near Preston)
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February 4, 2021 - 2:14 pm
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Hi Dermott, 

Not sure if you got sorted with your info req but I have a free minute so here goes:

On the D10 onwards bikes the coil is mounted onto the rear mudguard under the seat with a special coil mounting bracket that has two bolts. The HT lead usually grows out of the coil on the N/S. 

There is a bridge piece of metal that fixes the top rear corners of the inner side panels to the rear mudguard....the rectifier is mounted onto this with a special bolt that keeps it steady but does not allow you to tighten up the centre of the rectifier so much as to do damage.  The wires usually grow downwards from the rectifier and it has an earthing ring under its centre mounting....this is important.  

The horns can be found in a number of places.  These can vary from being hidden inside the side-panel / centre box assembly to being mounted onto the long side-panel to frame bolts at the front of the side-panel assembly where the horn is then visible and open to the elements.   

I prefer to hide the horn out of the elements by locating it inside the toolbox (N/S side panel ) where it gets some protection from the damp but beware that stuffing the toolbox with spanners, screwdrivers, bike mags, sandwiches and coke cans will only serve to muffle your horn.  There are lots of alternative places you can consider - like under the petrol tank for instance but make sure it is well earthed and I always recommend a fuse in the horn circuit.    

The 4 speed bikes have a switched variable charge system that relies upon all the elctricals being in tip-top condition. In normal running you can expect things to get hot under the seat around the rectifier mounting bolt so take care to ensure good electrical connections but also to check periodically to prevent rusting.  I learned a long time ago to run with side lights on in daylight as ( apart from obvious safety reasons),  this reduces the amount of electricity that the rectifier has to get rid of in the form of heat when the battery is fully charged.  

Hope this helps. 

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Dermot Bambridge
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February 19, 2021 - 11:26 am
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Thanks to all of you for your replies.  I have a clear picture now.  I overcame the air filter adaptor by buying an ally adaptor for £8 for a larger filter and getting a friend to turn it down to fit inside the filter body. 

To rhi010 - yes I worked for Scania for 15 years and I was technical editor on Hot Car magazine in the 1970s.  Did you work for Scania and live Peterborough way - Mark? EDIT email address removed for security reasons

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rhi010
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February 23, 2021 - 11:50 am
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Hello Dermot, You would remember my uncle as you were the same generation, I can't privately mail you, but you should be able to pm myself 

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Stoo63
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February 23, 2021 - 2:42 pm
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Dermot needs one more post(4) before the PM system leaps into action  - it's the wee envelope icon in the top of this box 🙂

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '91 GTR 1000;  '97 Honda Sky SGX50.

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