New Carbs

[Piet]

I notice someone on Ebay is selling a batch of new old stock (I assume) Solex 28 IBS carbs.
They look interesting/tempting to me because they have an accelerator pump and might give the R4 a ltittle bit more get-up-an-go than the usual zenith 28 IF.

Anyone have any thoughts on: experience with these, good or bad? How does parts availability compare to the zenith? What markets were they used in? Worth a try?

 

[angel]

The IBS has no accel pump.

I think it was never fitted officially on the R4, maybe it was available as an aftermarket alternative (?).

Solex parts tend to be more readily available compared to Zenith (at least here).

I had one of these on my grey '71, could not make it to run correctly no matter what I did, fitted a 28IF and saw instant improvement.

I fitted another one on a customer's late 845, to replace the wrong 26DIS fitted, and worked flawlessly after playing a bit with main jets and fuel level using an AFR meter.

 

[Piet]

Oh! Then what is the thing on the side of the float chamber? I thought it was an accel pump...
but maybe this isn't a 28 IBS at all, althouigh that is what they say it is. Or is it a later version fitted on something like an Extra?
NEW carb CARBURETOR fit RENAULT R4 GTL 11779001 1961-1992 R4 4L 4S and 4GTL
Type Solex 28 IBS(for 1108cc engine)

Item no. 321720082389

.

 

[angel]

It is definitely not an IBS, it looks like a chinese knock-off of the 32 EISA. Throttle diameter is definitely larger than 28mm.

Better stay away from this one...reminds me of a Taiwanese SU copy I had the chance to admire recently...