The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: montmil on May 09, 2016, 02:03:05 PM
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Just after returning from an Okie Airhead Tech Day, the port side carb began weeping fuel from the bowl gasket joint. I then spent a good part of Mothers Day by celebrating the successful replacement of the floats, float needles and bowl gaskets in both of the R100S 40mm Bings. To save you looking up numbers, the floats are BMW part #13.11.1.254.766 and are the same part number as those for the R65's 32 mm Bings.
Fresh out of the box, my vintage gram scale registered 12.50 grams for each new float. Bob "Snowbum" Fleischer states 10 grams new in his tech section. At least the ones I got are consistent. My scale is an old balance beam rig from model aircraft days and may not be as accurate as an electronic unit.
The old floats were heavily discolored and had a chalk-like layer of 'sediment' bonded to the metal portion of the float assembly which did, after drying, add to the 14.00 gram measured weight. Snowbum considers an 18.0 gram float as a total sinker.
The rubber tips on both float needles showed indentations where they contacted the fuel inlet port. Both needles and floats were the cause of the too high fuel level in the float bowls.
Here's the link to Snowbums section on Bing floats: <http://bmwmotorcycletech.info/bing-floats.htm>
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Maybe some Bing floats once weighed 10 grams but I don't consider that weight to be relevant to currently available new floats. My new floats weighed on very accurate lab scales to 3 decimal places came to 12.495 grams. If enough people weigh them at 12.5 grams I think we can agree that's the current standard.
What will be interesting is if your old floats still weigh 14 grams after some time on the shelf. My old floats didn't get appreciably lighter after more than a year of drying out. Snowbum does suggest that much of the weight gain is permanent. And he's right on 18 grams being sinkers too although I'd put it even less than that and say anything above 16 grams is close to incontinent.