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When I had cars with Webers that depends on the temperature or if the motor is hot and been sitting 15 minutes or more in the summer.
With cold motor I would listen for the fuel pump to fill the floatbowls and then give a pump or two of the gas pedal/accelerator pumps depending on how cold it is.
When I had dual 45DCOE sidefrafts on a BMW 2002, those carbs had the little cold start fuel enrichment throttle butterfly bypass enrichment devices that I had hooked up to the origonal manual choke cable.
They worked great for cold starts, raising the idle when cold and driving off, and then shut them off after around 30 seconds running.
With a hot motor in the summer that has sat 15-60 minutes there can be some carb percolation/vaporization of fuel that has spilled over into the throats. So the best way I found to start the motor is to keep your foot off the gas pedal and while cranking the starter motor, slowly open the throttles a little to give the motor more air without squirting a bunch more fuel in with the accelerator pumps. Then it starts.
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