Carb Bottom O Ring

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Carb Bottom O Ring

Postby nick_smith » Fri Mar 13, 2020 4:36 pm

Hi everyone!

My ‘79 HC 1256 carb is leaking fuel and I suspect the bottom o ring is to blame as I have had to replace this before. I wondered if anyone knew the exact size before I order a replacement as the one before obviously didn’t do the trick. Also, is anyone able to recommend a supplier?

Many thanks,
Nick
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Re: Carb Bottom O Ring

Postby viva les vegas » Fri Mar 13, 2020 7:10 pm

I don’t off hand know what the size is, but I would look to try and get parts that are compatible with ethanol as I’ve read recently that there are plans to change the petrol again from its current E5 to E10. If you’re changing it anyway, it might be something to consider.
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Re: Carb Bottom O Ring

Postby droopsnoot » Fri Mar 13, 2020 7:13 pm

What kind of carburettor is it?

I needed some for a Stromberg CD175, and found that in my big selection box of O-rings, nothing would fit quite properly. Luckily I had a rebuild kit lurking in a box, so I got one from there.
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Re: Carb Bottom O Ring

Postby nick_smith » Sat Mar 14, 2020 3:57 pm

droopsnoot wrote:What kind of carburettor is it?


I'm not entirely sure :? It is stamped with Zenith CD with no number. I can't find a similar Zenith one and it seems to match the images of Stromberg carbs I've seen
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Re: Carb Bottom O Ring

Postby nick_smith » Sat Mar 14, 2020 4:03 pm

viva les vegas wrote:I don’t off hand know what the size is, but I would look to try and get parts that are compatible with ethanol as I’ve read recently that there are plans to change the petrol again from its current E5 to E10. If you’re changing it anyway, it might be something to consider.


:thanx: I knew of the problem ethanol could cause but wasn't aware of the planned jump in content!
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Re: Carb Bottom O Ring

Postby droopsnoot » Sat Mar 14, 2020 6:59 pm

Perhaps you could post a photo of it, just to be sure. Someone will recognise it.
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Re: Carb Bottom O Ring

Postby nick_smith » Mon Mar 16, 2020 11:06 am

droopsnoot wrote:Perhaps you could post a photo of it, just to be sure. Someone will recognise it.


Here are a couple:

https://ibb.co/K7Cs6qh
https://ibb.co/QckvCg2
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Re: Carb Bottom O Ring

Postby 1972nail » Mon Mar 16, 2020 11:30 am

Zenith Stromberg CD 150. Commonly known as a Stromberg 150 in the Viva community.

Most Triumph specialists will be able to supply a butyl rubber O ring for about £1. Bear in mind that there are at least 2 sizes.

With the government plan to increase the ethanol content in petrol to 10% in the near future I'm hoping to be able to supply upgraded ones for our club members in the next few weeks.
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Re: Carb Bottom O Ring

Postby hbr341 » Mon Mar 16, 2020 8:51 pm

Hi David
If you do get some of the 0 rings for the club I would need some got twin 175s on the GT and a 150 on the SL and the HC thanks .

Regards Chris.
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Re: Carb Bottom O Ring

Postby nick_smith » Wed Mar 18, 2020 10:55 am

Thanks for your help everyone!

I’ve ordered some 15mm internal diameter (20mm external) x 2.5mm nitrile ones. Hopefully they will solve the issue.
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