Defeated by a set of Webers

[Paul W]

What a way to end a near perfect Sunday.

I had a very slightly erratic idle after changing out my faulty leads, changing the plugs replacing the dizzy cap and rotor a couple of weeks ago. The car felt like it had a big improvement in power, though the idle would sometimes vary from 850-1000 RPM – nothing major just a little annoying. I figured the other tuning work may have upset the balance of the carbs and perhaps the mixture.

Well having tuned these babies a couple of times before, I thought I had nothing more than an hours pleasant tinkering ahead of me. Unfortunately its turned into one of those classic cases of “fixin it ‘till its broke”. I’ve no idea what I’ve done but the idle’s so bad it sort of pulses every 5-10 seconds meaning I can’t sync the things properly. A slight backfire out of one of the stacks is much worse and after 4 hours of trying to sort the thing out I’ve given up. It’s off to the mechanic tomorrow with my tale between my legs.

My respect for you guys who maintain / improve and rebuild your cars has grown yet again.

I’m gonna find another beer…

[Formerly Steve Wilkinson]

I'm assuming you have a good Synchroscope? Can't imagine what could be wrong, if you use the old screw-in-until-it runs-rough, then back-out-till-it-picks-up technique on each cylinder, starting with the secondary jets set at a reasonable and uniform point, like 2.5 turns out. A few other details of course, but I assume you know them if you've done it before successfully. Unless there's something wrong or dirty--not unlikely--internally.

Stephan