OK, so the other guys who responded before I did were following the
right assumptions. I remember that you said if you blipped the throttle
before you took off, it didn't stumble. So that tells me that the
accelerator pump works, because that blip shoots in some gas. No blip
and it leans out and dies when the throttle is opened. According to my
Weber carb manual, the transition from idle to power (venturi feed) is
handled by the transition ports, which are fed by the idle passages.
The carb could be partially clogged up inside or there might be a slight
air leak under it.
Was this carb on the shelf for a while or did you xfer it directly to
the 1275 from the 1500, where presumably it worked OK?
Cheers,
CR
MartyWit@aol.com wrote:
>
> In a message dated 10/31/00 8:30:50 PM Eastern Standard Time,
> ccrobins@ktc.com writes:
>
> > Marty didn't say he had a hesitation when he floored it. It could be
> > but that's not what he said. Maybe it's when he opens the throttle
> > gently to accelerate smoothly from low RPM. If that's the case, the
> > accelerator pump isn't in the picture. Rather, if it's carb related
> > and the engine idles at normal RPM, the prob could lie in the transition
> > ports being plugged up or the idle is set too lean for it to make a
> > decent transition. A float prob can cause this too. Or a slight air
> > leak. Or, or, or........
> >
>
> Under no load, the engine will rev fine if the throttle is pressed gently.
> It does slightly stumble for a second if the pedal is mashed, though it
> recovers and continues to rev nicely from about 1700-1800 on. Under load is
> a totally different story. If the pedal is depressed quickly while trying to
> move away in first gear from rest it will falter, then stall, and I have to
> restart the car, usually with traffic behind me. If the pedal is slowly
> pressed downward the effect is not as large but it still falters, and I have
> to slip the clutch more which I don't want to do. I checked the float level
> when I first installed the carb, over five years ago on my 1500 Midget, but
> will check it again because I've a feeling it may be slightly low.
>
> Marty
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