Triumph twin Strombergs...

[b_caswell]

Re: Triumph twin Strombergs...

Most Strombergs have an alloy washer under the float valve some service kits supply more than one thickness.

David, before refitting the float bowl clean off the remains of the old gasket and then smear some grease on the new one to stop it sticking.

Best of luck

[David]

Re: Triumph twin Strombergs...

Thanks David & Peter,

I will go for a regulator once I have the carbs working again, or as a last try before binning them!

The needle valves have a brass washer between them and the casting, presumably that works better than fibre when being constantly immersed in fuel.

Will report back after the next attempt Tuesday evening.

[greyV8pete]

Re: Triumph twin Strombergs...

Most carbs that I have worked on had a fibre washer between the needle valve body and the carb. Maybe the supplier forgot to fit it which would be about par for their bodge level. Mechanical pumps usually have a thick (used to be asbestos) gasket between the pump and the block as a heat shield. I have been told that reducing the thickness of that will raise the fuel pressure due to increased cam lever stroke. Personally I would think that the spring undr the diaphragm would control the pressure and the gasket/ lever stroke would just affect the total flow per pulse. However both worth a check. Peter.

[davidmartin720]

Re: Triumph twin Strombergs...

I had a similar problem with my Roadster after I changed the mechanical pump on a Triumph Herald 1300 engine. I tried all ways to stop the carb flooding, a Groose float, still flooded, so I solved the problem with a pressure regulator. Since then I remember Ben saying that the brand new mechanical pumps have a greater pressure. David.

[David]

Re: Triumph twin Strombergs...

Unless all that crap in the float valve was from your system I would very much doubt the valve was a new one in the first place. It would certainly have needed a good clean out to get it working properly.
Another common problem can be fitting the float assembly upside down. Easy done with double tag type floats. Or the float level being too high. Or fuel pump pressure too high.
So not a polished performance from this carb company!!

I have ordered a new valve from Rimmers, and new float chambe bottom bung (as well as new gaskets, again). I hadn't removed the floats so they should be OK. ANnoying thing is the carb was working fine yesterday! Have double check my new filter(s) in the field line, no rubbish in them. Discounted fuel pressure a while back as same pumps that have been on for ages.

[philcoyle]

Re: Triumph twin Strombergs...

Unfortunately going on the state of the carbs that you have, it would seem that little attention was paid to the jets , floats, etc. and it is quite possible the needle valve seats are worn and that's why the fuel will not stop when the floats rise up.
I would ask for your money back, but going on what they turn out I would not expect them to be a reputable company.

[b_caswell]

Re: Triumph twin Strombergs...

Unless all that crap in the float valve was from your system I would very much doubt the valve was a new one in the first place. It would certainly have needed a good clean out to get it working properly.
Another common problem can be fitting the float assembly upside down. Easy done with double tag type floats. Or the float level being too high. Or fuel pump pressure too high.
So not a polished performance from this carb company!!

[philcoyle]

Re: Triumph twin Strombergs...

Gordon Bennett! I thought you had cracked it, you are having some bad luck. The only thing that comes to mind is the floats are sticking down in the bowls and so the fuel continues to pour out.
I think it's about time you named and shamed these cowboys who sell highly polished junk.

[David]

Re: Triumph twin Strombergs...

Well, that was too good to be true wasn't it.

I spent an hour running the engine yesterday whilst tuning and balancing the carbs and doing the timing. All good.

Cooled down over night, back out into the garage today and a quick spanner and screwdriver over nuts and clips to make sure everything was tight. Time for a drive.

Sitting in the driver seat I noticed that with ignition on the fuel pump didn't stop ticking, so pressure was not coming up. Of course fuel was pouring out of the front carb.

I whipped the carb off no crap in the float chamber but the float chamber needle valve was stuck up. I know that this means fuel should NOT be flowing if the valve is up but I thought I'd fixed that. So somehow the floats are not shutting off the fuel flow. Possibly still crap above the needle valve stopping it closing tight? What else causes overflow?

So Monday morning I will phone the supplier and ask for a full refund, I'm not happy having to continually strip and rebuild carbs that are supposed to be 'new'.

[b_caswell]

Re: Triumph twin Strombergs...

By the time I got home from Hereford you had it sorted, for those querying the choke system only the front carb has the extra fuel device and a transfer pipe goes to the rear carb. Obviously if the front carb was struggling for fuel then so was the rear.

David can you pm me the carb company so that I know not to advise anyone else to go there.

[philcoyle]

Re: Triumph twin Strombergs...

I'm just going to have a large Valium.

Good news , we can now all switch our brains off until the next time. Well done David for not giving up, and there is still some Summer left.

Give us the name of the firm to avoid, looks like a quick dip in carb cleaner and a polishing up on a mop, and bingo refurbished carbs, not.

[listerjp2]

Re: Triumph twin Strombergs...

Great news

[David]

Re: Triumph twin Strombergs...

Thanks Peter. Yes I think I'll get a beer as well.

Just the tuning and timing to do now.... what a relief!

[greyV8pete]

Re: Triumph twin Strombergs...

SOLVED

........................................

Excellent news! Well done! And what an appalling standard of refurb supplier you have suffered from.

I'm off to get a beer now and celebrate for you. Peter.

[dogoncrazy]

Re: Triumph twin Strombergs...

Guess we hit the send at same time . Glad you got a result. Pm where not to purchase from.