Guys with a Weber carb...check this out...

Look at the video (toward the beginning) where he explains where the vac hose hooks up below the carb. I had mine hooked up to the port above the intake...and the one he shows that's hooked up to the vac advance...I had plugged...so I had them in reverse order of how he shows it. I just went outside and swapped it and WOW...what a difference. The secondary actually makes a difference now and you get instant throttle response. Maybe I'm the only guy here who did it that way and maybe it's old news...but maybe it might help someone...

Check it out...

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