Club126UK

Fiat 126 Chat => Fiat 126 Mechanical Problem Solving => Topic started by: 126Simon on February 10, 2019, 09:39:26 AM

Title: 652cc carb specs
Post by: 126Simon on February 10, 2019, 09:39:26 AM

Ok so I understand the 600cc engine used a 28 IMB 3 carb and the 650cc a 28 IMB 5

Anyone know what the difference between these carbs is? For some reason my 652cc Deville has an IMB 3 on it.....

Should I invest in the correct IMB 5 or get a rebuild kit for the 3? It's leaking air through the butterfly spindle.

Cheers
Simon

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Title: Re: 652cc carb specs
Post by: Da Londo on February 10, 2019, 12:08:05 PM

This of any help?

Title: Re: 652cc carb specs
Post by: 126Simon on February 12, 2019, 01:30:02 PM

Thanks that info was helpful

I've just received a brand new Weber IMB 5 / 250 in the post......

There's no cap and gauze over the needle valve, the fuel in and out pipes are joined in the bore. Anyone had this before?

Cheers
Simon

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Title: Re: 652cc carb specs
Post by: Rusty's Uncle on February 12, 2019, 05:40:38 PM

That will be one of the made under license reproduction carbs then. Some were made in Spain and some in China I believe. Do let us know how you get on with it .

Title: Re: 652cc carb specs
Post by: 126Simon on February 12, 2019, 06:42:14 PM

Thanks Rusty

Well the box is Spanish anyway, looks quite nicely made.

What's with the lack of a gauze? Do they assume everyone has inline fuel filters?

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Title: Re: 652cc carb specs
Post by: Rusty's Uncle on February 12, 2019, 07:01:26 PM

Quote from: 126Simon on February 12, 2019, 06:42:14 PM

Thanks Rusty

Well the box is Spanish anyway, looks quite nicely made.

What's with the lack of a gauze? Do they assume everyone has inline fuel filters?

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I can only assume that it was a cost saving measure. If you are fitting an online filter make sure that it is on the inlet side of the fuel pump and not between pump and carb.

Title: Re: 652cc carb specs
Post by: 126Simon on February 17, 2019, 07:52:33 AM

Carb seems good far better than the IMB3 that was on there. Nice slow smooth idle and it picks up well. Plus all the pop pop popping on over run is gone.

It always started well when cold but struggled when hot, this is much improved.

Overall if it's a cheap repro carb it's good enough will see how long it lasts.

Simon

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