LH carb

SteveHop · Nov 25, 2021

I noticed on my R100R that the LH floatbowl does not have a small vent pipe coming up from the bottom .The RH one does have one.

Im sure that this can't be right ?

Anybody know ?

Big-G · Nov 26, 2021

Expand the images to show inner view.

https://www.motorworks.co.uk/vlive/Shop/Parts.php?T=5&NU=15&M=20&Ct=FA&SbCt=BA_15_20_FA_43

Gelandestrasse · Nov 26, 2021

Looks like a pre-mod / post-mod issue

r100gser · Nov 26, 2021

Carb

The pipe in the float bowl is an overflow pipe, the link below might help, if the place in the float bowl where the pipe fits is blank it’s the type on the left, if there is a hole and it’s been blocked up it’s a bodge

http://www.gunsmoke.com/motorcycling/r100gs/carb_rebuild/

SteveHop · Nov 26, 2021

r100gser said:
The pipe in the float bowl is an overflow pipe, the link below might help, if the place in the float bowl where the pipe fits is blank it’s the type on the left, if there is a hole and it’s been blocked up it’s a bodge

http://www.gunsmoke.com/motorcycling/r100gs/carb_rebuild/

Thanks for the info , im getting one with a vent . Dont like the idea of a leaking needle just filling the bowl up.

Thanks

Gelandestrasse · Nov 26, 2021

Steve, I've just read up on this and some of it chimes with my experience. Thanks for raising it! I've had a school day.

My experience was forgetting to shut off the fuel taps on my R10RS with 40mm Dellortos. The left hand pot filled with petrol and I got a hydraulic lock when starting. Luckily it didn't fire. Stupidly I tried a few times (not knowing what was going on - it felt like a flat battery). Then I twigged and slowly turned the engine over in 5th gear with the back wheel. I got it turning eventually (fuel leaking through the gaps in the piston rings I guess) and then hit the start button. A few miles of doggy running then it cleared and all good again. Perhaps fitting in-line filters might be a good idea after all.

SteveHop · Nov 27, 2021

Gelandestrasse said:
Steve, I've just read up on this and some of it chimes with my experience. Thanks for raising it! I've had a school day.

My experience was forgetting to shut off the fuel taps on my R10RS with 40mm Dellortos. The left hand pot filled with petrol and I got a hydraulic lock when starting. Luckily it didn't fire. Stupidly I tried a few times (not knowing what was going on - it felt like a flat battery). Then I twigged and slowly turned the engine over in 5th gear with the back wheel. I got it turning eventually (fuel leaking through the gaps in the piston rings I guess) and then hit the start button. A few miles of doggy running then it cleared and all good again. Perhaps fitting in-line filters might be a good idea after all.

I notices that sometimes the bike would turn over on the strter ok sometimes and at other times it struggled.
Ive taken the bowl off ant there was far to much fuel in there. So ive taken the carbs off , will have a good look at the shutoff needles and replace if necessary and get a floatbowl with a vent tube. Here is a picture of the offending article, no vent

LH carb

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