Tom,
Make sure you don't get the "throttle adjusting screw" confused with the
"fast-idle adjusting screw".
WFO Herb
Ulix Goettsch wrote:
> Tom,
> 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?
>
> Ulix
>
> 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 __/__,__ ___/__|__
> ..............................................(_o____o_)....<_O_____O_/...
> '67 Sprite '74 X1/9
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