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Author Topic: Carb tuning  (Read 2739 times)
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Posts: 60

« on: 01 June, 2011, 03:16:23 PM »

Hi all
I (think I have) managed to adjust my carbs so the car is idling well, using the four idle control screws. However, the car refuses to run properly at all under any load whatsoever, unless the engine speed is increased very slowly.

The timing appears to be okay, what else could be the cause of the problem?

Permanent resident
Posts: 1576

« Reply #1 on: 02 June, 2011, 07:24:40 AM »


It sounds like the idling jets are clear and working OK, but other jets inside the carbs at the bottom of the float chambers may not be. Also, the accelerator pumps underneath the carbs may not be functioning. If the carbs have been refurbished then the diaphragms for these pumps should have been replaced and the push-rod linkages that work them should have been checked.

Think yourself lucky you are not trying to fix this with a sideways opening bonnet as on early Sports!

Regarding your other question about engine oil - I favour Fiat/Selenia HPX. There have been other posts on the Forum about this oil it is 20/60 semi-synthetic, not hugely expensive and does what its supposed to do, which is good for old engines.

Permanent resident
Posts: 6002

« Reply #2 on: 02 June, 2011, 10:14:48 AM »

No connection to them but having just Googled it
Have it for 27.54 inc Vat which seems to be 3-4 at least cheaper than anywhere listed, unless Colin knows different Wink

8227 Cool

Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
2006 Renault Megane 1 5 Dci Sports Tourer
Dedra Technical Adviser
Posts: 60

« Reply #3 on: 05 June, 2011, 08:47:00 PM »

Thanks for the replies, chaps.
Done some more investigation and it would appear that you are indeed right - the acceleration side of things isn't delievering any fuel. The pumps seem to be working correctly, however.

Just had the carbs off the cars and in bits - cleaned out all of the jets and plunger bearings as far and as well as I can, they were very full of crud indeed. Hopefully that will have sorted my problems.

Out of interest, is there anywhere that will supply single parts for carbs, such as, say, a new diaphragm or a new main jet?

Many thanks for the input
Press Officer
Permanent resident
Posts: 4359

« Reply #4 on: 05 June, 2011, 09:06:57 PM »

New Solex Main jets (whats wrong with yours?) are not readily available but recon kits with all gaskets and diaphrams are nearly always on ebay c 30.

Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia 1600HF
1972 1600 Fulvia Sport
1979 2500 Gamma Coupe
1988 Delta 1.6GTi
1998 Zeta
Senior Member
Posts: 175

« Reply #5 on: 19 June, 2011, 10:53:58 PM »

Hello Richard

I have found that eBay shop :-   in Italy are very good at supplying Solex parts, including jets.   English seems to be understood, and they offer a very good service, in my opinion.

Regards - Roddy

Roddy Young
Dunfermline, Fife

1970 Fulvia Sport S1 1.3S
1972 Fulvia Sport 1600
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