The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: rspivee on July 16, 2009, 04:22:01 PM

Title: Rebuilt Bing had a floatbowl leak
Post by: rspivee on July 16, 2009, 04:22:01 PM

I took the little guy out for a ride the other day and my right toe started getting wet as I cranked the engine.   Fuel was leaking out of the floatbowl which was you know awesome.   The Bings on this bike('79 r65) were rebuilt by a BMW dealership recently.   I put the bike up and started to go into a funk when it ocurred to me the last time I rebuilt the su carbs on my MG the float got stuck in one of them.   I went back out and gently tapped the Bing lightly and turned on the fuel and no more leak woohoo.   I have ridden it about ten miles on two different trips and no leaks.   You guys think it was just kinked up because it is new or should I worry about a bad rebuild?  My plan was to ride until it happened again but I am a little worried about washing the cylinder walls with gas if it happens again.   I am new so sorry it this is elementary.  

Thanks,

Title: Re: Rebuilt Bing had a floatbowl leak
Post by: montmil on July 16, 2009, 05:07:30 PM

Perhaps a bit of trash kept the float needle off the seat, allowing the overfill. Do you run an in-line fuel filter? I dunno, but IMO the only thing getting a gas wash is your boot. :)

Monte

Title: Re: Rebuilt Bing had a floatbowl leak
Post by: Justin B. on July 17, 2009, 01:02:34 AM

If the rebuild consisted of new floats and needles then it's probably as Monte speculates.  If you are running rubber gas lines then it's likely they are deteriorating internally and you will continue to have this "wet boot syndrome" until you sort it out.  I have "backflushed" through the gas inlet (from needle side) and got a bunch of hard black granules - that's the rubber bits that intermittently cause the float needle to not shut off.

I've switched exclusively to urethane fuel lines so at least I won't have that issue anymore.

Title: Re: Rebuilt Bing had a floatbowl leak
Post by: MrRiden on July 17, 2009, 10:41:42 AM

A bit of overflow from a spec of debris holding the float valve open can happen and is most likely what you experienced. As stated above a good quality fuel line and filter should ally your fears. Don't forget to turn off your fuel valve as some of us have been surprised with a garage full of gas fumes when forgetting to do so.
rich

Title: Re: Rebuilt Bing had a floatbowl leak
Post by: rspivee on July 17, 2009, 02:35:19 PM

Cool beans, I will give the whole system a going over and replace the lines.   Thanks again.