you don't mention having synchronized the flow of the cabs with a Unisyn
and having made sure that the throttle plates start opening at the same
time. Could that be it?
Other than that, you could check:
* the position of the throttle plates when supposedly closed
* when you lift each piston with the pin does it fall back down freely
with a clunk?
* do you have fixed needles? Are they the same? Are they the correct
ones? Are they mounted in teh piston correctly?
* Are the springs present inside the "dome"?
* have you tried setting both carbs the same to start with, i.e. both
mixture jets down 2 turns?
On Sun, 16 May 1999, Tom Zuchowski wrote:
> Once again, I turn to the all-knowing wisdom of the List. . .
> I was doing some tune-up of my 1275 yesterday. The carbs have always been a
> little odd, but I think they are getting worse:
> 1) With the idle screws backed all the way out, it idles at about 1200 RPM.
> I run them in a quarter-turn so they won't fall out, and that runs the idle
> up to about 1500 RPM. It's a nice smooth idle, although it's so high.
> 2) There is no mixture adjustment on the front carb that won't result in an
> immediate drop in RPM when I lift the slide with the button. The plugs look
> pretty good, though. I've tried hitting the gaskets with WD40 and don't
> notice any change. The float height appears to be within specs.
> 3) On the other hand, the back carb is pretty close to right when the
> mixture nut is run ALL the way up.
> 4) Using the colortune system, I think I have the back carb real close, but
> I don't really know where I am on the front carb since I can run the mixture
> nut down 3 or 4 turns and not really see a color or slide-lift difference.
> 5) The front carb has a plastic float and the back one has a brass float.
> Should I get matched floats?
> I'm guessing that something isn't quite right with each of the carbs. I
> rebuilt them last year after a 9-year sit in the garage without running, and
> either I did something wrong or else there is something loose or gummed up
> that I missed, perhaps. The car starts well and runs well, although it has a
> real tendency to run-on after switch-off.
> I would be most grateful for any helpful hints. Thanks!!!
> Tom Zuchowski
> Clemmons, NC
Ulix __/__,__ ___/__|__
'67 Sprite '74 X1/9