Quote:
Originally posted by captainrb
I have been told that Weber's will have a stumble/hesitation between low speed circuit and the high speed circuit.Not bad but anoying. \
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FWIW I've never been able to detect the transition between the idle and main circuits. Before I got the carbs three years ago I was worried about a "dead" spot. Suprised the heck out of me when I actually started driving the car. It was and still is absolutely seamless from 1000 to 7000 rpm.
That said - I have run into a situation you describe, and it took a fair bit of teardown to find the root cause. Turned out that bits of the o-rings around the mixture screws had found their way into one of the emulsion tubes, and one of the main jets. The car idled fine, but when it hit the mains it would stumble. I chased that for a while, even installing a new fuel manifold (nice PMO system BTW) since I thought I was running out fuel under full throttle. The same o-rings plugged off an idle jet once too, but that time it caused a distinct miss at idle and low revs.
Needless to say, I don't use o-rings around the mixture screws anymore.
Good luck with your problem. It is fixable.