If you can get the carb top off without destroying the
gasket a rebuild kit won't be needed, but you'd better
at least have one lined up just in case. The
accelerator pump nozzle stays in the carb body by
virtue of a taper-fit, if you grasp it at the base and
wriggle it'll come right out for cleaning. Reinstall
and aim so the squirt comes close to the wall of the
venturi, then tap into place (holding with pliers and
tapping the pliers with a light hammer works).
When you open the throttle the manifold vacuum
decreases - this causes fuel to condense on the
manifold walls so that the air/fuel mixture making it
to the cylinders is lean (the condensed fuel dribbles
down there eventually, but in droplets too large to
burn well). The accelerator pump's function is to
inject enough extra fuel to compensate during this
temporary condition. Keeping the manifold warm so fuel
is less likely to condense in the first place does a
lot for off-idle driveability, especially when it's
cool and damp outside. On a warm day, once the
engine's had a minute or two to warm up you'll hardly
miss the preheat. A functional thermostatic aircleaner
and ducting to bring warm air into the carb helps some
too, as does the initial off-idle timing "kick" that
you get from a stock SVDA or DVDA distributor (a lean
mixture will fire better as a rule with more spark
advance). WORST combination is no preheat, no
thermostatic aircleaner, and a
centrifugal-advance-only distributor...you can usually
get away with any one of those three conditions, but
not two or more.
--- dan moy <[EMAIL PROTECTED]> wrote:
> Peter,You will have to remove the carb. Purchase a
> rebuild kit. If you don't have access to compressed
> use brake clean to make sure the ports from the
> accellerator pump is clear to the spray
> nozzelCompletely clean the carb, Replace all gaskets
> and test..Dan --- On Wed 03/26, Peter Perez <
> [EMAIL PROTECTED] > wrote:From: Peter
> Perez [mailto: [EMAIL PROTECTED]:
> [EMAIL PROTECTED]: Tue, 25 Mar 2008
> 21:22:04 -0700 (PDT)Subject: Re: [vintagvw] After 12
> volt upgrade, flat spot off idle?Thanks for all the
> tips guys. Well i took the decklidoff (because i
> couldn't get my melon head in closeenough to look
> down the carb) and started working thethrottle with
> the engine off. Well it didn't look likethere was
> anything coming out of the accelerator tube.So I
> start it up and go back and mess with it somemore
> and still nothing coming out. So I think I'vefound
> the problem. So do I need to take the wholething
> apart and soak it or just take the top off
> andblow everything out? Also Marc, will the preheat
> flanges not being drilledout cause a performance
> problem? There were smallholes there but I could
> have certainly made thembigger. Thanks again for all
> the help gang!-pete --- marc vellat wrote:>
> Nothing to do with the 12V conversion should be>
> DIRECTLY responsible for this, but if you had
> the> carb> off and it was jostled around
> something could've> gone> awry in the
> accelerator pump department.> Did the new exhaust
> system come with the preheat> flanges drilled?
> Hardly any aftermarket exhausts> have> more
> than a rudimentary provision for the intake>
> manifold preheat - they won't provide anywhere
> near> the flow that a stock muffler does. Drill
> 'em out as> big as you can without hitting
> daylight and you'll> at> least have a little
> convection flow.> > > --- Chuck Kuecker
> wrote:> > > Did you check to see that the
> accelerator pump> > squirter tube is > >
>
> squirting, and aimed to squirt straight down the>
> > carb bore and miss the > > throttle
> plate?> > > > Was the engine running
> right before the header?> You> > might need
> a bit > > richer idle jet, or main jet, or
> both.> > > > Chuck Kuecker> > >
> > Peter Perez wrote:> > > So I finally
> get all the 12 volt bits installed> > >
> (alternator, coil, fuel pump, idle cut off,>
> choke,> > > lights, etc). Also installed a
> euro two tip, the> > one> > > with
> glass pack and the large tips, on an> >
> otherwise> > > stock 1300. Take it out for
> the first drive and> > > there's a really
> bad flat spot off of idle that> > wasn't>
> > > there before. If I accelerate gradually
> it's> fine.> > if> > > I stab it
> it falls flat. If I rev it it's ok. If> I>
> > > stab it and hold it, dies.
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