Hello All, I rode my 350 sherpa last weekend and if started to p*** fuel out of the overflow on the carb. It didn't matter if it was running or not. I took the float bowl off and everything seem ok. It's never done this before and I would like to keep my Bing.

Could just be a bit of dirt between float needle and seat, or damaged float.

Did you pull the float out? It’s easy to do and like mentioned above it’s probably junk caught in needle and seat. A quick teardown should alleviate the problem.

carb overflows are common to every manufacture of carb. Bing is no exception. 

Is there an inline fuel filter installed? 

Thanks for the replies. I'll do a full strip down and clean and see how I get on then thanks again for the help 

check banjo too

Good afternoon. I stripped my Bing down cleaned and refitted and still leaking fuel out of both overflow pipes even then not running. I restripped and replaced the float needle valve checked floats themselves and they seem ok but still having the same problem. Spoke to inmotion and he has recommend me getting a new Mikuni 26mm what do people think? I like the way power is on the Bing tho.

Many thanks

 

Take the floats out and shake them.  You can feel the gas shaking in the floats if it is in there. If there is a hole, that would be a problem.  I have had this happen.

 Replace the float, it's the same one used in the 32mm Bings on BMW airheads and is available and inexpensive. I've been running a used BMW float for a few years but I think it might be time to buy a new one. I can't fault the logic that the best repair for a Bing is to replace it with a Mikuni though.

Mikuni 26 is a good overall performer. OKO 26 will give you more top end and 1000(?)rpm more but perhaps Mikuni is slightly stronger in the bottom. Both of them have a soft power delivery. I like the OKO

About Bing I don´t know

On 2/18/2019 at 2:01 AM, motovita said:

 Replace the float, it's the same one used in the 32mm Bings on BMW airheads and is available and inexpensive. I've been running a used BMW float for a few years but I think it might be time to buy a new one. I can't fault the logic that the best repair for a Bing is to replace it with a Mikuni though.

Thanks Motovita. Where would I get one of those floats from? Inmotion said Bing floats are discontinued and any parts are really hard to find now. I don't want to change for a Mikuni but may have to.

I have a BM , motobins and motorworks in the UK will have parts they're where I get all my bits

Regards

Bill

7 hours ago, evo boy said:

Thanks Motovita. Where would I get one of those floats from? Inmotion said Bing floats are discontinued and any parts are really hard to find now. I don't want to change for a Mikuni but may have to.

 

 The float I used was from my 94 R100 GS and was identical to the original float. In the U.S. BMWs came with 32mm carbs, in other markets 40mm carbs were standard, I don't know if they use the same float so you might double check that. In the U.S. I've found BMW dealers to be a good, and the least expensive, source for Bing parts.

Edited February 19, 20197 yr by motovita

Must be the only thing for which BMW dealers are the cheapest source?

11 hours ago, bill black said:

I have a BM , motobins and motorworks in the UK will have parts they're where I get all my bits

Regards

Bill

Thanks Bill. I have found a float that looks right. Doesn't anyone know If this is?

Just bought a float listed for BMW myself.The seller was on ebay but looks as though mine was the last one as they are no longer listing it. Looks the same as you have shown and fits fine in Bultaco Bing 84 or whatever it is. From memory the Bing part number is 300 or 301.