[TR] Triumphs Digest, Vol 16, Issue 170. TR6 carb "problem"

Tue Oct 3 17:48:48 MDT 2023

 This is in reply to Frank Burkhart about his carburettors.
 It sounds as if you carbs just need a rebuild and this is easy to do yourself if you are in the least mechanically minded. Just go to "Buckeyetriumphs.org and look under" technical" and you will find comprehensive instructions how to do this amd tune them up. If you are not mechanically minded send the carbs to Joe Curto in New York his E mail is joecurto at aol.com and phone is 718 762 7878.
>From your description of the engine being awash with gas at start up it sounds like the needle jets are stuck open or the floats are full of fuel. 
I was not aware that Apple Hydraulics dealt with carburretors and replacing a piston in a carb is not to be done since it disturbs the original carb set up and I can't see why a piston should be damaged beyound repair anyway.
As your car is a '76 if you live in California you cannot replace the carbs with SUs because it would fail the emissions test. 
Just stick with the Strombergs and do't let anyone tell you that SUs are better. The only reason Triumph and other British cars manufacturers changed from SUs to Strombergs was because of emissions. SU was obviously not prepared to put the development work in to make their carbs emission compliant.

Stuart A Greenwood

     On Tuesday, October 3, 2023 at 11:36:08 AM PDT, <triumphs-request at autox.team.net> wrote:  

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Today's Topics:

  1. Carburetors (Frank Burkhart)
  2. Re: Carburetors (Lee&John Howard)
Hope this email is appropriate to send.  I=E2=80=99m hoping that someone =
out in Triumph world can provide some clarification on carburetors.  =
Currently, Zenith Stromberg carbs on my 1975 TR6.  The car has been =
running poorly since Trimphest (too many RPMs?).  And then it died =
completely but turned out to need a new rotor.  Asked the mechanic, =
Mike, to take a look at the everything to figure out what can be made =
better.  What he found was the carbs were dumping gas into the cylinders =
especially when starting, to the point the gas was washing down the =
cylinder walls preventing the rings from sealing.  Result was a lot of =
white smoke.

The carbs were rebuilt about 18 months ago by Apple Hydraulics in New =
York.  Supposedly all new parts including a new piston in one of the =
carbs.  Mechanic Mike is questioning the quality but . . .  Several =
paths to try:

1.  New needles and basic over haul.  Least expensive but maybe stopgap =
measure.

2.  Rebuild these carbs using a different shop.  Mike recommends a shop =
in Colorado. I=E2=80=99m would worry about a 2nd rebuild in short period =
of time.

3.  Replace the carbs.
3a.  Mike has a pair of SU carbs in good shape.  Mike would replace =
=E2=80=9Cconsumables=E2=80=9D and install

3b.  Find a pair Stromberg carbs

3c.  Mike likes carbs by Mikuni

3c.  Replace with Webers

Any ideas / suggestions on what path seems the best?

Hope all the world is going well for all.  Hope to see everyone at =
Velocity.

Thank you,
Frank Burkhart

FrankThis is absolutely an appropriate  query to the NBTG. I expect you'll have some helpful responses. I personally am surprised that Apple Hydraulics seems to have botched the job - they're supposed to be the best.
John

On Thu, Sep 28, 2023 at 5:58 PM Frank Burkhart <islandgirl.sausalito at gmail.com> wrote:

Hope this email is appropriate to send.  I’m hoping that someone out in Triumph world can provide some clarification on carburetors.  Currently, Zenith Stromberg carbs on my 1975 TR6.  The car has been running poorly since Trimphest (too many RPMs?).  And then it died completely but turned out to need a new rotor.  Asked the mechanic, Mike, to take a look at the everything to figure out what can be made better.  What he found was the carbs were dumping gas into the cylinders especially when starting, to the point the gas was washing down the cylinder walls preventing the rings from sealing.  Result was a lot of white smoke.

The carbs were rebuilt about 18 months ago by Apple Hydraulics in New York.  Supposedly all new parts including a new piston in one of the carbs.  Mechanic Mike is questioning the quality but . . .  Several paths to try:

1.  New needles and basic over haul.  Least expensive but maybe stopgap measure.

2.  Rebuild these carbs using a different shop.  Mike recommends a shop in Colorado. I’m would worry about a 2nd rebuild in short period of time.

3.  Replace the carbs.
3a.  Mike has a pair of SU carbs in good shape.  Mike would replace “consumables” and install

3b.  Find a pair Stromberg carbs

3c.  Mike likes carbs by Mikuni

3c.  Replace with Webers

Any ideas / suggestions on what path seems the best?

Hope all the world is going well for all.  Hope to see everyone at Velocity.

Thank you,
Frank Burkhart

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