Club126UK

Fiat 126 Chat => Fiat 126 Mechanical Problem Solving => Topic started by: Bambino126 on February 26, 2016, 09:51:06 PM

Title: Carb rebuild.
Post by: Bambino126 on February 26, 2016, 09:51:06 PM

I'm re-building my carb with a kit which includes 4 o-rings. I don't know where they should go, they're all different sizes.
Anyone done this?
It's the standard Weber 30 DGF 3/150 from the BIS.

Title: Re: Carb rebuild.
Post by: dadandlad on February 27, 2016, 09:13:47 AM

From memory
The large o ring fits the large flat headed screw on th right hand side of the carb
One goes on the mixture adjusting screw
One goes on the accelerator pump jet
Struggling to remember where the fourth goes

Title: Re: Carb rebuild.
Post by: Bambino126 on February 27, 2016, 08:53:22 PM

Thanks dadandlad,
I've now just fitted those ones.

Anyone know where the 4th one goes?


One more question... the book says the float level should be 10 mm. But where is that measured from?
If it's from the lid to the top of float, the needle would barely be opening.

Title: Re: Carb rebuild.
Post by: dadandlad on February 27, 2016, 09:54:43 PM

I used this to set my float height as the same carb is fitted to the Panda 30

http://club126uk.co.uk/forum/index.php?action=dlattach;topic=5769.0;attach=4090

Title: Re: Carb rebuild.
Post by: Bambino126 on February 28, 2016, 10:15:55 PM

Very useful.
Thank you again.

Title: Re: Carb rebuild.
Post by: Rusty's Uncle on February 29, 2016, 05:21:45 PM

Quote from: dadandlad on February 27, 2016, 09:54:43 PM

I used this to set my float height as the same carb is fitted to the Panda 30

Yes the carb fitted to the Panda 30 is the Weber 30 DGF but it is different to the Bis in that it does not have the restricted venturies with two at 23mm like late Weber 30 DIC carbs.

Title: Re: Carb rebuild.
Post by: Gadge on March 01, 2016, 09:42:35 PM

So would a panda 30 carb be more free flowing than a BIS carb?

Title: Re: Carb rebuild.
Post by: Bambino126 on March 01, 2016, 11:05:34 PM

I would doubt it to be be honest because they are both Weber 30 DGF's just with different jetting to suit each car.

Also I've noticed Axel Gerstl sell 2 different versions of the 30 DGF both shown as applicable to the 126 BIS. The 3/150 version that came as standard and a 4/100 version.

http://webshop.fiat500126.com/katalog/showarticles/150102/1/carburetor

The panda one in the diagram dadandlad put up says it is a 1/250 version, does anyone know what these numbers mean? Is it to do with jets?

Title: Re: Carb rebuild.
Post by: Rusty's Uncle on March 02, 2016, 09:10:47 AM

Quote from: Gadge on March 01, 2016, 09:42:35 PM

So would a panda 30 carb be more free flowing than a BIS carb?

As far as I am aware it was the forum member Deyan who first highlighted the variations in the carbs and said that the Panda 30 carb was the way to go if you wanted to get more out of a Bis. It does seem to be quite logical as a known tuning mod on the 500 carbs is to have the Venturi enlarged. Also when the Fiat 500R cars were on sale at the same time as the early 126s although they shared the same engine the 500R was slowed down by having a restricted carb fitted.