The Triumph 2000 / 2500 / 2·5 Register Forum

I had a spare pair of carbs, so got a good knowledgeable friend of mine to strip them and re-build them with new gaskets etc while I ran the car (1970 2000) on the existing, original carbs, which ran fine but were leaking enormous amounts of oil.

My mechanics here in Germany have now removed the old ones and put the recon ones on the car. After a little fiddling it idles beautifully, but gets all in a tiswas at about 1500rpm (especially on the road). Higher revs are also fine and it sounds great.

What could be causing this problem?

The new carbs are also from a 2000, but a slightly later one with extra vacuum connections on each side that normally go to a T piece and to the rocker cover. My car is the earlier type with a diaphragm thing on top of the inlet manifold, so the mechanics (who are very good, but have no Triumph/British car experience) have simply blocked each vacuum hole thing on the carbs, (the originals don't have one at all). Is that ok like that?

Any suggestions?

see, i presume you mean something like this
http://www.canleyclassics.com/triumph-g ... o-ke10001e

the emission control valve is not required with the above set up


are your air filters/back box to air box the correct way up as the strombergs have smaller aperture above the main carb opening that affects running if occluded

http://www.canleyclassics.com/triumph-g ... e-no-10001

It would also be worth checking the needles and springs (above the diaphragm). If the replacement carbs came from a very late 2000, that would have had a different CAM so different needles.

I'd be tempted to put the original needles into the rebuilt carbs and see how that goes. The needles should have their type stamped on them (or we can look them up!) and replacements are available.

The springs were fairly constant through the years, but other rate springs were available.

Cheers,
Mike.

Thanks for suggestions, yes the picture here:

http://www.canleyclassics.com/triumph-g ... -ke10001e/

shows the right carbs. The chaps have now run hoses from each carb to a tee piece then to the rocker cover and it seems much better. The only slight issue now is that as my rocker cover is the earlier one (where the hose goes to the diaphragm on the inlet manifold and not to the carbs at all) I now have no flame trap gauze.... not the end if the world though is it?

Some fine tuning is still required, but generally it runs really well. Shall I buy a replacement rocker cover with the flame trap gauze? Witor does an inline flame trap thingy, I suppose that would also do the job.