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1. 10:56 PM - Re: Bing 64 Idle circuit inlet aperture drilling 3300A (Thruster87)
2. 11:12 PM - Re: Re: Bing 64 Idle circuit inlet aperture drilling 3300A (Martin Hone)
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| Subject: | Re: Bing 64 Idle circuit inlet aperture drilling 3300A |
I've been having trouble getting my mixtures correct as on turning base and bringing
back the rpm below 2000 it starts to surge down to 1500rpm and then up 300
rpm and if I pull back below 1500 it surges and then stops.On the ground all
seems OK, idles at 800rpm and static runs to 2800 rpm with no surging.It is
still set to factory jetting [3300A solid lifter with 30hrs only].What I have
done so far is to pull the induction system apart and re-seal it.Drilled out the
LLD to 1.5mm and trying with diff positions for the mixture adj.1/4 turn back
from fully screwed up into the carb and then turning clockwise 1 full turn.
with still the same results but running a bit hotter.Checked fuel bowl level
OK. Any ideas [looking at changing the jetting next] Carby fed by engine driven
pump and electric pump. On a 601xlb
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=363808#363808
Message 2
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| Subject: | Re: Bing 64 Idle circuit inlet aperture drilling |
3300A
Is the LLD you drilled to 1.5mm the air bleed at the intake bellmouth or
the fuel jet in the float bowl that feeds the starting jet(choke) ?
If the airbleed then you would be looking at turning out the idle mixture
screw a bit more than 1/4 to 1 turn. More like 1.5 to 2 turns. If it is
the jet in the float bowl, it shouldn't have made any difference to the
mixture unless the choke is activated for starting. It sounds like you
should have eliminated any induction leaks, although a spray at all the
joints with WD40 while the engine is idling will tell you if there is still
a leak. Make sure that the idle speed of 800 rpm is with the throttle
physically pulled all the way.
Martin
On Sun, Jan 15, 2012 at 4:53 PM, Thruster87 <alania@optusnet.com.au> wrote:
> alania@optusnet.com.au>
>
> I've been having trouble getting my mixtures correct as on turning base
> and bringing back the rpm below 2000 it starts to surge down to 1500rpm and
> then up 300 rpm and if I pull back below 1500 it surges and then stops.On
> the ground all seems OK, idles at 800rpm and static runs to 2800 rpm with
> no surging.It is still set to factory jetting [3300A solid lifter with
> 30hrs only].What I have done so far is to pull the induction system apart
> and re-seal it.Drilled out the LLD to 1.5mm and trying with diff positions
> for the mixture adj.1/4 turn back from fully screwed up into the carb and
> then turning clockwise 1 full turn. with still the same results but
> running a bit hotter.Checked fuel bowl level OK. Any ideas [looking at
> changing the jetting next] Carby fed by engine driven pump and electric
> pump. On a 601xlb
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=363808#363808
>
>
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