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New Replacement Carburettor for D1/D3 Models
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GlenAnderson
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February 5, 2021 - 12:48 pm
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Some time ago, there was a thread where somebody had been in touch with Amal/Burlen about new replacement carbs for the 261/361/523 models. If I remember correctly there was, at the time, little chance of tooling up to produce new copies of these carbs, but there was some talk of using a 400 series Concentric with a clip fitting. Do we know if there was any progress at all or did it just die a death?

 I ask, because I’ve just spent a considerable amount of money having a 523 reconditioned and it’s come back with a crack in the body. I don’t know whether to keep trying to get a better secondhand one, or explore other alternatives. 

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cocorico
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February 5, 2021 - 1:04 pm
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Look at previous posts on Dellortos.

I've had my D3 running using a Dellorto PHBG (15mm to 19mm seem suitable). I didn't progress to playing with jets, but have a note of what was working. Available in direct fitting as an AMAL, or needing a rubber sleeve.

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cocorico
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February 6, 2021 - 8:58 am
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Have a look at ** Please log in to view **, my post (9) has a link to Dellorto UK

Glen, would it be possible to repair the damage with aluminium solder / Lumiweld?

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GlenAnderson
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February 6, 2021 - 11:22 am
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512C167B-53DB-41F0-8190-FC4918AFCBD0.jpeg53C886C3-2161-4B0C-B207-65F7BA34FDE3.jpego

 

I do have a little Mikuni I could try, but I would prefer a traditional looking carb as they’re such a visible item. 

The crack is from one of the slots in the clamping tube. Most likely I can get away with it; I’m certainly going to give it a try. 

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cocorico
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February 6, 2021 - 11:55 am
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You could probably use a smear of silicone mastic if there's an air leak there.

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GlenAnderson
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February 6, 2021 - 12:15 pm
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cocorico said
You could probably use a smear of silicone mastic if there's an air leak there.  

Yes, or a wipe of Wellseal. I’m probably going to stick with the Amal. I’ll just keep my eyes peeled for a good body. 

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Number6
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February 6, 2021 - 6:48 pm
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I'd look at filling it with JB weld or equivalent. Also available, Evo-Stik metal epoxy putty, Unibond epoxy putty, Q-Bond, that kind of thing. But put it on the stub first, cos the clamp will close up the crack.

http://livinginthepast-audioweb.co.uk/imagex/misc/idunno.gif

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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Jim
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February 7, 2021 - 5:28 pm
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I would try some JB weld in there, it sets like concrete and is very strong once cured and will prevent any possibility of an air leak

Jim

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Number6
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February 7, 2021 - 11:16 pm
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It only needs to stop air going into a little hole. laugh

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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GlenAnderson
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February 8, 2021 - 10:57 am
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There’s no point in trying to weld it, the base material simply won’t tolerate the heat necessary. Looking at it, I suspect the damage was done by someone ham-fistedly levering the carb of at some point in the last 60+ years. The clamp should close it up and prevent any worsening, and as has been pointed out, it only needs to be assembled in a way to prevent the possibility of air ingress. So the most it’s ever going to see is 14 psi, and a wipe of Wellseal will definitely stand up to that. 

In the meantime, I’ll keep my eyes peeled for a better body. I did a side-by-side with the D1 carb this morning and it’s quite surprising just how much bigger the 523 is in comparison. 10% bigger bore diameter means a jump from 0.307 sq in to 0.371 sq in, which is an over 20% increase in area, which goes a long way to explaining why a D3 will run on a D1 carb, but not very well. 😃

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GlenAnderson
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February 9, 2021 - 10:49 am
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Well, I’ve managed to pick up a couple more bodies from the dreaded eBay, without spending a fortune. I shall inspect them carefully when they get here and if they’re ok I’ll send them off for cleaning up. 

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cocorico
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February 9, 2021 - 11:24 am
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GlenAnderson said
...if they’re ok I’ll send them off for cleaning up.   

Have you tried boiling them with washing powder?

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GlenAnderson
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February 9, 2021 - 12:14 pm
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I will give that a go. I’m fairly confident that the one with the crack will be ok, but I want to have my bases covered just in case. 

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Lone Wolf
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February 10, 2021 - 6:12 pm
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cocorico said

Have you tried boiling them with washing powder?  

Wotcha.

That's what I do with carburettors that need a good clean out. . . . . and so far it's always worked.

^..^

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Lone Wolf
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February 10, 2021 - 6:14 pm
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Lone Wolf said

Wotcha.

That's what I do with carburettors that need a good clean out. . . . . and so far it's always worked.  

^..^

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stubaker58
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February 11, 2021 - 10:23 am
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I’ll have to PERSILvere 🤦🏻‍♂️ (..... I’ll get my coat)

“There’s nothing new under the sun”.

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cocorico
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February 11, 2021 - 11:51 am
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stubaker58 said
I’ll have to PERSILvere 🤦🏻‍♂️ (..... I’ll get my coat)  

It also works on Ariels...

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Lone Wolf
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February 11, 2021 - 2:45 pm
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cocorico said

It also works on Ariels...  

Wotcha.

That's a bit of  a BOLD statement 🙂

^..^

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cocorico
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February 11, 2021 - 4:14 pm
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It will TIDE me over, stop FAIRYing about... cant-look

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FrankG
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February 11, 2021 - 10:58 pm
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The outcome could be DAZzling. get-me-coat  

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