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I might be inclined to reexamine the float. As I discovered the hairline cracks they can suffer from can be almost invisible.
Ciaoflyer is actually a member here!!! He used to have a 126 Bis for some years. He sold it, and bought a 2CV.
There is one for sale on eBay at the moment should you need to replace the part or use it to prove that the carburettor is not the problem and that the root cause is elsewhere.
Fiat 126 Mechanical Problem Solving / Rattle in rear suspension
« Last post by Amateb8 on April 21, 2018, 07:58:29 PM »
I am going to replace both rear absorbers on my Bis. The rear suspension is a bit bouncy, or getting bouncier. It is weird that it does not get checked in the MoT. To cure this, I bought a complete set (includes bushings at the bottom and rubber bits on top) from Ricambio. Just looking at the repair history, the shocks haven't been replaced.

Whilst I am thrusting the rear frame downwards to check the shocks, as stated above, there is a rattling sound. To be exact, when I continually bounce the rear suspension, for every bounce, there is one ring/bell sound coming from the rear passenger side suspension. Perhaps the shock absorber bushing is defective. When driving the car on medium road undulations, the rear suspension passenger side, is noisy, as if there is a can with a small stone inside. The noise disappears when there is a passenger in the car.

What can be causing the ring/bell sound? I need to get the car onto a ramp to check.
I bought an unfinished 126 Bis and having problems getting the engine to start and then when it does getting it to run consistently.

Once the engine has fired and run for a few seconds I can see petrol pouring into the choke tube and sitting on the butterfly. (the number two choke tube). There is no leak in the float so I thought the float height/fuel level might be too high but it appears to be close to the recommended 6mm. In an attempt to locate the cause I adjusted the float to about 10mm so lowering the fuel level significantly but fuel still floods into the choke tube.

I could not get the engine to run last year but I have since completely stripped and rebuilt the carburettor. I did not find anything that looked to be faulty or worn out so I am baffled as to what the problem is.

This topic has come up quite a bit on the forum but I could not find an answer to this.

Meetings & Events / Re: Southern Carvery - Saturday 21st April - CANCELLED
« Last post by Bar Vitelli on April 20, 2018, 10:38:00 PM »
It's a deal, Pete, once a year I get all my cars out on the lawn, we'll get you over for that if you are free, no posh nosh though, it will be fish finger sandwiches and ketchup or tartare sauce if you are really lucky!  :thumbup
Tuning & Customising 126 Models / Re: Engine Porn 2
« Last post by DEYAN IYI on April 20, 2018, 09:32:21 AM »
Since my daily ride is an i-VTEC Honda Stream, my 126 engine porn dreams  :$ came to a higher level - 21-st century one.  ;D

The bad thing that it is almost impossible to build a reliable aircooled head.

 Probably it is easier to put vertical a Bis engine and fit a DOHC head with the same cylinder center to center distance - Alfa Boxer or Subaru, or a half from 4 cyl. head, if there is some luck.

The engine with the red valve cover reminds me of Alfa Twin spark, but can't be sure.

Meetings & Events / Re: Southern Carvery - Saturday 21st April - CANCELLED
« Last post by Pete126 on April 20, 2018, 08:47:25 AM »
Thanks Gary, Look forward to that ;D
Carverys are good, Pete, but fish finger sandwiches are much better, we'll have to get you over for one this summer! Best that shakey achey Rusty has ducked out, whatever he's got it don't sound good!   :o
Get well soon Rusty I think I will have to cancel the carvery this year will see most of you at Brands Hatch Festival Italia 😀
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