[TR] ZS 175 carbs

davgil at aol.com davgil at aol.com
Tue Oct 2 06:00:11 MDT 2018

Thanks Jack,
I didn't have any trouble removing the screw once I could get a screwdriver on it.  The head was so rounded from previous owners, that nothing would grab.  I wound up cutting a slot in the head and using a straight screwdriver and it worked fine.  My challenge was trying to thread an 8 or 10 (I don't recall) 32 screw into the body and found it did not thread beyond a couple of turns.  I feared it was Whitworth or something else, didn't consider metric.

Thanks for the response.  Another list reader sent me information that they were M5 0.8,and just slightly over 12 mm long, so I believe that an M5 0.8 12 would be an acceptable substitute.  I am thinking about going to that with cap screws so it will be obvious not to use a Phillips on a Pozidriv screwhead.  

Best regards,
David Gill




-----Original Message-----
From: Jack McGahey <McGaheyRx at aol.com>
To: Sujit Roy <triumphstag at gmail.com>
Cc: Creig Houghtaling <creig555 at live.com>; davgil <davgil at aol.com>; Triumphs <triumphs at autox.team.net>
Sent: Mon, Oct 1, 2018 7:37 pm
Subject: Re: [TR] ZS 175 carbs

If you have standard thread screws holding the dashpot covers on the Stromberg carbs in your Stag - that could explain why they are hard to come out.  ;-)

I just pulled one out of a Stag carb and in turns quite easily into an M5 0.8 thread checker. Since this came up today, I’ve done the same with TR6 carbs, TR7 carbs, TR8 carbs, and some new screws I pulled out of the bag they came from Moss in. They all have the same part number and they are all M5 0.8. Same part number for all CD 175s and the CD 150s on GT6s

I did not know this until it came up today - I’ve always ordered the correct part - after rebuilding hundreds of these carbs, I knew they weren’t SAE, but I always figured they were Whitworth or British Standard - or something odd like that - I was as surprised as anybody when they turned easily into an M5 0.8 thread checker.

If you still don’t believe me, I can send pictures.

Jack Mc

Sent from my iPad

On Oct 1, 2018, at 4:51 PM, Sujit Roy <triumphstag at gmail.com> wrote:

The Stag has ZS carbs. Those screws are pozi drive heads. But the screws don't show that pozi. drive symbol on the head. Standard not metric. Some of mine were buggered by POs. Trying to remove them with standard Philips screw driver


71 Stag

On Mon, Oct 1, 2018, 11:02 AM Creig Houghtaling <creig555 at live.com> wrote:


See if a #10 or #8 machine thread works.  It is one of these, but I don't remember which.  I always buy new bolts and lock washers from the hardware store for carb top covers.  You can buy stainless.  And it doesn't cost as much.

My friend had metric size bolts holding his carb tops on his TR8.  I suspect that was because a previous owner put them in because they were close in size and he just forced them in because they were into aluminum.

What are you referring to for damper 0-rings?  If you are referring to the tiny one at the bottom of the dashpot that holds the dashpot oil around the metering needle, then yes that is a standard size o-ring that you can buy.  The o-ring around the fuel reservoir plug is standard and can be bought too.


From: Triumphs <triumphs-bounces at autox.team.net> on behalf of davgil at aol.com <davgil at aol.com>
Sent: Monday, October 1, 2018 8:44 AM
To: triumphs at autox.team.net
Subject: [TR] ZS 175 carbs

I worked on the carbs on my 1976 TR6 this weekend, one of the needle adjustments screws moved and I was able to lean the carb I needed for some improvement.  A couple of questions, does anyone know the specs on the screws holding the top cover to the body of the carb?  Someone (not me - honest) buggered them up and I had to cut a slot on one to back it out.  I would like to just replace them all.  Moss has them at $1.89 apiece but that seems a bit much.  I had a couple of screws in my loose screw bin that looked correct but did not seem to fully thread into the carb body and I didn't want to force them and ruin the threads.  Also, if the damper o-rings are a standard size that I can pick up at a local FLAPS instead of ordering them, i would appreciate knowing the specs on those as well.  

David Gill
1976 TR6

** triumphs at autox.team.net **

Donate: http://www.team.net/donate.html
Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/triumphstag@gmail.com

** triumphs at autox.team.net **

Donate: http://www.team.net/donate.html
Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/mcgaheyrx@aol.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/triumphs/attachments/20181002/ef8b1a12/attachment.html>

More information about the Triumphs mailing list