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That sounds like the float level is too high.

I just went thru the Weber 32/36 on my 72 GT. Set the float exactly as described - note that there are two settings to limit total float travel. Opened the secondary a crack (an RCH; think the spec said 0.011"?). Turned the mixture screw out 3 turns. Put a few turns on the idle screw. Fired it and warmed it up and started adjusting. Got the idle set at 900, don't remember where the mixture screw ended up at - solid as a rock and purrs like a kitten.

Only other tip I can pass on is don't overtorque the cover screws as well as the base mount nuts. Overtorqueing the nuts can distort the base and cause leaks and throttle blade bind.

doug
 

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What model Weber, and with what type float?

Weber book I'm looking at (and used for mine) provides the following for the DGV and DGAV: the carb cover must be held vertical with the float hanging from the hinge pin. You'll measure from the carb cover to the bottom of the float in two positions. One position is float up, needle lightly closed: 1.53". Other position is float down or dropped position with needle valve open: 1.96".

You are setting needle valve closed/float up position and float 'drop' position [book sez Closed position dimension and stroke dimension].

Mine didn't idle worth a hoot with the float settings off in left field relative to the above. Once I set it to this it's rock steady.
 
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