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D3SA - D5 Dualseats
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Piquet
West Norfolk
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June 11, 2016 - 12:12 am
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As there doesn't seem to be much information regarding the seating for these models I thought I would place this here for future reference.

I have these 3 seats, from the left D5, D3 and (I think) D1/D3 plunger.

I have had the D5 and D3SA bikes for a considerable time (over 40 & 50 years respectively) and know most of their history so I'm fairly sure they are original.

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D1/D3 plunger front bracket

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D3SA front bracket

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D5 front bracket

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The D3SA seat and the D5 seat appear to be the same basic shape, however, the D5 has some 'deepening panels' fixed to the sides at the front.

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As the D5 front bracket is longer, the whole seat fits further back on the frame. The frame supports on the D3SA virtually line up with the holes in the seat base but you can see where the supports have left their mark on the D5 seat, forward of the holes.

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This appears to be as a consequence of the different tank shapes fitted to the 2 models. The D3 tank tapers at the rear and allows the seat to overlap the tank whereas the D5 has a rounded, bulbous tank, the seat therefore has to fit further back and the sides are deepened towards the front to cover the gap that would otherwise spoil the lines by leaving a big gap between the seat, tank and frame.

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NOTE:- Not my bikes, pictures included to illustrate seats and tanks.

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The supports on my D3SA have bolts, spacers and washers fitted and presumably the rubbers are fitted over the bolt heads and rest on the washers (those are A10 rubbers sitting on the cross-member as Bantam ones appear to be made from unobtainium now).

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My D5 has nothing fitted in the frame supports and the rubbers just fit over the top.

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According to the parts books, the rear brackets are different too. This is the D5 one, I don't have a D3SA one as mine is missing but I think it has slightly more 'rise' to the seat fixing arms.

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D5 bracket removed and pictured/measured

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This is a picture ** Please log in to view ** (the one and only picture I have been able to find, (so far)!).

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Another rear bracket handmade by Jess in the restoration/build of his fantastic D3SA (also shown finished)

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A couple of pictures of an original D3SA dual-seat rear bracket (thanks again Jess!)

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This is the D3SA seat base,

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and the original foam.

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Just for completeness, this number is moulded into the upper surface of the foam,

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and there is something printed on it?

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Included BSAdave's D5 seat pan here as an aid to ID as it has a better view of the deeper sides.

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More information ** Please log in to view **.

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  • sp_PlupImage D5SeatPan01.jpg(357 KB)
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  • sp_PlupImage D5SeatFoam.jpg(395 KB)
  • sp_PlupImage D5SeatBracket-rsz.jpg(821 KB)
  • sp_PlupImage Original-D3SA-Seat-Bracket01.jpg(326 KB)
  • sp_PlupImage Original-D3SA-Seat-Bracket02.jpg(390 KB)

I'm not a complete idiot ............................................ some parts are missing.

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Maddog Leary
Melbourne Australia
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June 11, 2016 - 12:49 pm
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That is one beautiful D3 swingarm..... D5 isn't bad either! (what am I saying, they are both fantastic.......).  At least I now know I have the right seat for my D3.  Mindyou, my seat bracket is very different (Heath Robinson job - no internet in the eighties LOL). Nice articulate and detailed post.

MD cheers

Maddog - 56 Swingarm D3 Major -  Major Works in progress! Machine is fighting against me every which way!

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Kirkbybil
Harrogate
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June 17, 2016 - 9:14 pm
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That's a really useful post Piquet - I just wish you'd done it before I had to figure mine out thoughlaugh

If you see later on in my D5 resto post ([Permission to view this media is denied]
) I think I actually had a D3 seat and had to make a bracket to suit. It ended up looking okay but wish I'd had your post to refer to.

It will be really useful to future restorers.

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GlenAnderson
Dover
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August 19, 2016 - 10:16 pm
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Does anyone know if there are new seats available for the D3 S/A machines? The ones supplied for swingers B31/33 models looks very similar...

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Piquet
West Norfolk
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August 19, 2016 - 10:32 pm
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The 'A' series 'round nose' seats are identical to the D3 S/A but the brackets are different. I believe new replacements (42-9072?) are available from various suppliers and are also listed for some 'B' series models.

Moulded seat foam and covers available from ** Please log in to view ** for both D3SA and D5. They may be able to supply new pans or complete seats too, I understand they have the patterns/templates in their inventory.

hope-that-helps

I'm not a complete idiot ............................................ some parts are missing.

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GlenAnderson
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August 20, 2016 - 12:57 pm
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Thanks for that - I can make brackets no problem!

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cocorico
Central France
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February 3, 2017 - 12:59 pm
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Looks different from mine:[Permission to view this image is denied]
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 apart from the part that fits on the mudguard.

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cocorico
Central France
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February 4, 2017 - 2:16 pm
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Just to confirm some of Piquet's pictures, here are some of my D3 SA from 1956. Largely the same, apart from some additional webs under the seat pan. Mine is also missing the rubber buffers and has two spacers between the seat and the rear bracket to space the seat off the mudguard.

Rear bracket:

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Seat pan:

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Though, thinking about it, if the rear bracket was a bit straighter (ie not following the curve of the guard), the spacers wouldn't be necessary.

As far as I am aware, everything is original.

sp_PlupAttachments Attachments
  • sp_PlupImage Seat-bracket.JPG(87 KB)
  • sp_PlupImage IMG_0411-resize-1.JPG(266 KB)
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Bola
Swindon
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February 6, 2017 - 10:42 am
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What a great Topic Piquet. Yes i'm trying to get a D3 Swing arm back on the road but its fighting all the way! cry

I fear you are correct and the seat we got is not the correct one. I was able to borrow a old original (I think) seat. Here are the differences. Looks like we might have to go and get another seat and make all the brackets required.

 

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Bola
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December 11, 2017 - 2:39 pm
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Following on from the duel seat post. Did the seats covers have piping?

I've seen some with and without. 

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  • sp_PlupImage Seat-Pipe.png(270 KB)
  • sp_PlupImage Seat-no-pipe.png(320 KB)
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cocorico
Central France
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December 11, 2017 - 4:16 pm
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This was mine on receipt - original with no piping.

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Piquet
West Norfolk
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December 11, 2017 - 11:48 pm
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I'm fairly sure both my '57 (Devon Red) D3SA and '58 (Black) D5 have original seat covers, both have white piping.

I'm not a complete idiot ............................................ some parts are missing.

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