carb question

[extra300s]

Hi guys

Has anyone noticed that the bing 54 carb’s idling jets have obvious grooves in to allow for a o ring to fit there. Plus when I went to my local BMW motorcycle dealer and showed him the carb, he immediately said there should be a o-ring as his parts list for similar bing carb shows it like that.

Is there a good reason for not installing it? I would recon u could have a better seal beween the carb bowl and intake side by fitting them.

Any comments?

[extra300s]

Aviation engines confirmed that there must be one... I must parts sketches I have seen it does not show the o-ring.

[ZS-NEL]

This was a modification after they find that the clip holding the needle can came of during flight and cause an engine out. Remember reading this somewhere sometime ago.

[ZS-NEL]

Found it. See here: http://www.ultralightnews.ca/bing/needleclipupdate.html

This update prevents wear on the needle and clip. The update requires the purchase of part #831-715 a rubber 0 ring which fits on to the top of the needle, and the installation of a NEW style retaining cup part # 827-347. The new retaining cup has a cut out for the rubber O ring which puts pressure down on the clip and needle to prevent them from turning and wearing.

[Wargames]

This was a modification after they find that the clip holding the needle can came of during flight and cause an engine out. Remember reading this somewhere sometime ago.

The question is not about the needle o-ring, but rather the lack of an o-ring on the idle jet.

[ZS-NEL]

Sorry het soos my g@t gelees.

[Morph]

Not shown in the May 2009 version of the Illustrated Parts manual

[extra300s]

Thanks Morph! Strange that they told me to put it in. I did and boy o boy does that motor sound sweet. Idles like a 4 stroke, got power of a turbine