| Date: | Thu, 13 Jul 2000 18:31:09 |
| Subject: | Bing Carb Adjustments |
| From: | Art S. |
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Chris,
There are only a couple of things you can adjust on that carb. You already got
the float and you can see the idle stop screw on the side. The fuel mixture can
be adjusted by changing the setting on the tapered needle protruding from the
bottom of the air slide. You will see that it's position is determined by a small
clip inserted in one of four grooves on the top of the needle. This clip then
rests inside the bottom of the slide.
(Your only other option to change the mixture would be to replace the jet, but
chances are it's fine unless it has been damaged.)
Also, you may want to check that the slide is moving up and down freely and that
the throttle cable is not hanging up. I would also check that the piston, rings
and head are not carboned up, since I have seen this be a cause of similar
symptoms.
Good luck!
LoTec
cris lepage wrote:
> My '78 Puch has a Bing carb. When you start the engine, it idles fast
> with no choke on (our outdoor temp. is at the 100 degree mark these
> days). After a short engine warm up, the idle speed drops to a low,
> uneven, sometime stalling engine speed. When I restart the engine, I
> have to increase the idle speed using the screw provided. I think the
> poor idling is being caused by a rich mixture, however, I can not find a
> idle circut, nor anyway to adjust the idle mixture!!! I have tinker
> with the float setting, hoping this will have some effect, but nothing
> doing..... Any recommendations on how to lean out the idle mixture?
> Thanks, Cris
>
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