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Old 01-04-2019   #61
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Re: weber 26 carb rebuild / tuning

Yes I might be interested in doing that. Let me get back to you tomorrow.
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Old 26-08-2019   #62
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Re: weber 26 carb rebuild / tuning

Maybe not of much interest to others here as its not a fiat 500 but my ford sidevalve has a Weber 26 IMB. With the standard zenith carb it struggled up hills at 20mph. Now it gets up hills at 40mph. Proving my thoughts that the engine struggles to breath. Thinking a 28 might be better with standard jets rather than the 26 with larger jets.
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Old 26-08-2019   #63
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Re: weber 26 carb rebuild / tuning

Simple answer is nothing, the IMB10 was fitted to the 500L and the IMB6 to the 500F. Same fitting and specification.
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Old 4 Weeks Ago   #64
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Re: weber 26 carb rebuild / tuning

Had the weber 26 IMB 10 on my ford sidevalve for some time now and pleased with the performance of it such that it is. But I have a problem starting from cold. Engine fires briefly and dies several times before eventually struggling into life, I have to leave it until it's running a while before opening the throttle or it dies. Turning the idle mixture screw in or out makes no difference to how it runs and may have some bearing on why it struggles to fire up. I'm going to ultrasonically clean the carb again and blow it out with air but if anyone has any suggestions I would appreciate them.
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Old 4 Weeks Ago   #65
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Re: weber 26 carb rebuild / tuning

The IMB series of carbs do not have a 'choke', but a 'fuel enrichment device'. The problem could be as simple as what is ample enrichment for a 2 cylinder 500cc engine, is not enough for a 4 cylinder 1172cc engine. The fact that you have to let the engine warm up before you can drive away would seem to support this thought. Adjustment of the idle-mixture screw having no effect on this problem would be another pointer to the fact that cold-start enrichment is not enough. Fitment of the bigger 28IMB MAY improve performance, but the cold-start-warm-up problem will, I suspect, still exist.
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Old 4 Weeks Ago   #66
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Re: weber 26 carb rebuild / tuning

Appreciate your input. As I was told the 500 is a twin and the ford is a four cylinder and both engines only fire one cylinder at a time. Ok the ford is 293cc per cylinder and the 500 is 249cc I guess so 20% bigger capacity. I did consider the 28 but I adapted the throttle linkage with a part from a solex that connects to the rod operated throttle of the ford and this rotates in front of the idle mixture screw, yes the one that doesn't seem to work. The 28 carbs mixture screw sticks too far and would foul on my throttle linkage.
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