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Old 25-08-2015   #16
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Re: weber 26 carb rebuild / tuning

Hi Anders,

The carbies are completely interchangeable.

Chris
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Old 29-10-2015   #17
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Re: weber 26 carb rebuild / tuning

Hi Chris,

Thank you. We took the parts from the old one and put it in the new housing (since it was the housing that had split open). We couldnt get the new housing to fit unfortunately.

Now the cars is not running very well. it dies and will not rev when flooring the gas pedal. The mechanic (60+) does not know what to do at this point other than getting a new carburetor exactly the same as before...? Should that be nessesary?

BR
Anders
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Old 01-11-2015   #18
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Re: weber 26 carb rebuild / tuning

Hi Anders,

It's always difficult diagnosing these problem half a world away so all I can really advise is to check everything - fuel, timing, distributor, tappets etc.

I wrote a thread on the IMB a while ago - here is the link

https://www.fiatforum.com/500-classi...26-28-imb.html

Chris
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Old 25-03-2016   #19
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Re: weber 26 carb rebuild / tuning

Just completed a partial rebuild on the carb. All the info here is great ! Discovered that the mechanic that replaced my last float just soldered the holes with petrol still in the float ! Seems to idle great and drive much better ! A little unsure if I have the idle/mixture set correctly but it seems ok ?
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Old 26-03-2016   #20
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Re: weber 26 carb rebuild / tuning

Same here. Not sure if the idle mixture screw is set right. I get some lurching at high revs and can smell some gas after driving. She idles good though.
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Old 26-03-2016   #21
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Re: weber 26 carb rebuild / tuning

No lurching noticed yet !
Smell of petrol also !
Will give it another few days and see how it goes.
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Old 26-03-2016   #22
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Re: weber 26 carb rebuild / tuning

In the words of Ferry Porsche---'if it aint broke, don't repair it' so if the car is running well, idling well with no smell of petrol, leave it alone and just keep a watching eye on it.
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Old 13-03-2017   #23
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Re: weber 26 carb rebuild / tuning

Hi there,

I am sorting out some issues with my freshly restored car.
The car idles beautifully but will stall when pressing the gas /accelerator.
The ignition timing looks to be set ok, so I suspect the carburator which is a weber 26 IMB.
Would any of you have an idea about what could cause this issue?
Looking forwards to your suggestions.
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Old 13-03-2017   #24
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Re: weber 26 carb rebuild / tuning

Check for vacuum leaks around base of carburetor. Spray some carburetor cleaner or starter fluid around the base of the carburetor while the engine is running. If the idle speed increases, you have a leak. You may have a plugged jet or passage inside the carburetor. The mixture may be adjusted too lean. The carburetor float may be set too low or is binding (not enough fuel in bowl).
Probably best to just take the carburetor off, clean, blow out all jets and passages, and replace all gaskets. Not that hard to do.
John
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Old 13-03-2017   #25
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Re: weber 26 carb rebuild / tuning

Thanks John,
I will take it apart and let you know what I find.

Rene
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Old 20-03-2017   #26
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Re: weber 26 carb rebuild / tuning

I took the carb apart and found that it was very dirty, seals were leaking and the float setting was way of. Needless to say that the car, after rebuilding the carb, runs much better now
Thanks again.
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Old 11-09-2017   #27
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Re: weber 26 carb rebuild / tuning

Quick question in the hope that somebody knows the answer.
What is the difference between a webber 26 IMB3 and 26 IMB1?
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Old 11-09-2017   #28
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Re: weber 26 carb rebuild / tuning

Quote Originally Posted by reneb View Post
Quick question in the hope that somebody knows the answer.
What is the difference between a webber 26 IMB3 and 26 IMB1?
The IMB1 is the original carb used on the 500N and early 500D models. Rare carbs to find in good condition these days. Tha IMB3 is the ultra rare carb which was fitted to the 500 Sport models. It had a slightly larger Venturi than all the other 500 carbs and ran with a larger main jet.
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Old 11-09-2017   #29
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Re: weber 26 carb rebuild / tuning

Would the larger Venturi and main jet of the IBM 3 fit in the body of an IBM 1?
My car has the IBM 3 but the body is badly warped. I can find an IBM 1 carb but nor a 3. Could I swap the parts?
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Old 12-09-2017   #30
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Re: weber 26 carb rebuild / tuning

Quote Originally Posted by reneb View Post
Would the larger Venturi and main jet of the IBM 3 fit in the body of an IBM 1?
My car has the IBM 3 but the body is badly warped. I can find an IBM 1 carb but nor a 3. Could I swap the parts?
Where is it warped, bottom flange? If so there are several postings on the forum explaining the procedure of how to recover from that. I think I'm right in saying Toshi is the go to guy for this. Hope this helps you.
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