Tom,
Thanks. The jets check out ok. The problem, or _a_ problem, that I
just found is an air (vacuum) leak at the manifold.
Jeff
---
On 1/2/00, Tom Zuchowski wrote:
>The jets on my 1275 have wildly different settings, like yours.
>
>One thing to check for that bit me is to make sure that the jet is fully
>seated when the choke is off.
>
>Tom Zuchowski
>'61 Bugeye (1275)
>Clemmons, NC
>
>----- Original Message -----
>From: Jeff Boatright <jboatri@emory.edu>
>To: <spridgets@autox.team.net>
>Sent: Saturday, January 01, 2000 1:11 PM
>Subject: rich and lean
>
>
> > Dear Spridgeteers,
> >
> > I've recently noticed that upon initial acceleration, my engine
> > (1275, dual 1.25" SUs) stumbles. Also, while sitting at idle, the
> > engine seems to "load up", with the rpms becoming lower and erratic.
> > Checking the carbs., I found that balance and idle were OK. I reset
> > the mixture by screwing the jets upwards until they were both flush
> > with the bridges, then down by two turns (12 flats). I attempted to
> > fine tune using the method of slightly lifting the piston and looking
> > for a change in rpm (a steady rise in rpm indicating too rich, an
> > immediate drop indicating too lean, and a brief rise followed by a
> > drop indicating just right). Doing this, I found that the front carb
> > was about right at only 6 flats down from bridge and the rear carb
> > was right at 15 flats down. This seems way off; typically these
> > settings would have caused the front carb to be way too lean and the
> > rear to be rich.
> >
> > Any thoughts on this? I've not encountered such different settings
> > before. Also, the erratic idle rpm seems to come and go now, so it's
> > not fixed entirely. Could this be a float bowl problem?
> >
> > Thanks in advance for any thoughts on this.
> >
> > Jeff
> > Jeff Boatright __o_\__ '65 Austin-Healey Sprite
> > http://userwww.service.emory.edu/~jboatri/sprite/sprite.html
> >
Jeffrey H. Boatright, PhD
Senior Editor, Molecular Vision
http://www.molvis.org/molvis
"Seeing the Future in a Very Tiny Way"
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