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Old 10-05-2014, 08:13 PM   #1
oldbmw OP
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Bing rubber tipped float needle?

I was wondering if there is an aftermarket rubber tipped Bing replacement float needle that would seal better than the OEM metal float needle. I rebuild airhead carbs as needed and sometimes the new needles I install still leak and not seat. I have new seats but have not mustered enough courage to try to remove and replace the brass seats yet.
Thanks for any ideas.
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Old 10-05-2014, 08:31 PM   #2
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IIRC, the last set I bought were viton tipped from Bing.
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Old 10-05-2014, 08:31 PM   #3
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Seats don't fail often, but if new meedles won't fix the leak, then a new seat is in order.
Got to tap the seat with a 8mm tap in order to pull the seat out.
Pulling the seat can then be done with a slide hammer or a screw extractor, as someone here uses.
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Old 10-05-2014, 09:08 PM   #4
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The best tutorial about replacing the needle seats on our Bing carbs was done by inmate _cy_. It is post #892 in the tips and tricks thread. http://www.advrider.com/forums/showt...169507&page=60

There is supposed to be a rubber tipped needle from Amal carbs that fits. I think it was Amal?
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Old 10-05-2014, 09:15 PM   #5
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Thanks for the info.
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Old 10-05-2014, 10:03 PM   #6
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I found the info about the Amal carb needles. Part # 622/197 for a mono concentric Amal carb found on certain Triumph BSA and Norton bikes.

I haven't tried these yet but they look like a good fit. I found a pair on Ebay for $19.00
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Old 10-05-2014, 10:10 PM   #7
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Quote:
Originally Posted by ME 109 View Post
Seats don't fail often, but if new meedles won't fix the leak, then a new seat is in order.
Got to tap the seat with a 8mm tap in order to pull the seat out.
Pulling the seat can then be done with a slide hammer or a screw extractor, as someone here uses.

I had meedles once, that was a long time ago.
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Old 10-05-2014, 10:34 PM   #8
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Originally Posted by robtg View Post
I had meedles once, that was a long time ago.
German meedles? They'll work.
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Old 10-05-2014, 10:48 PM   #9
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German meedles? They'll work.

I feel much better now knowing that, thank you.
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Old 10-06-2014, 05:40 AM   #10
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Quote:
German meedles?
Arrrgghhh! Tooo early.



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Old 10-06-2014, 07:00 AM   #11
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FWIW, new rubber tipped needles alone did halt the leaks from my /2 era Bings.
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Old 10-06-2014, 07:22 AM   #12
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I bought a pair of the Amal Viton tipped float needles and will give it a try.
Thanks
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Old 10-06-2014, 08:04 AM   #13
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I've always had success cleaning up brass needle seats using toothpaste applied to the end of a Q-Tip chucked up in a battery powered drill.

Run toothpaste or some sort of mild abrasive like liquid clay bar in there in a circular motion and it will polish up the brass ever so slightly. I've never seen a seat that was worn or had damage. If someone jabbed a steel pick in there, all bets are off :)
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Old 10-06-2014, 09:11 AM   #14
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Good tip!
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Old 10-06-2014, 11:21 AM   #15
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Toothpaste "polish/abrasive" is good. A slightly more abrasive agent is Bon-Ami cleanser-- contains fine feldspar crystals, which is hard enough to cut, but still very soft. For example, use it with an old (but not grooved) needle to "lap" the seat down if you have pitting. Oderwise, replace the seat...

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